The amount of 0.120M calcium hydroxide required to titrate 50.0 ml of 0.0998M HBr to the equivalence point is 41.5mL.
Concentration of CaOH is 0.120 M.
Concentration of HBr is 0.0998 M.
Volume of HBr is 50.0 mL.
The moles of HBr = concentration × volume
= 0.00499mol
At the equivalence point, moles of HBr are 0.00499 moles, equal to moles CaOH.
Hence, the volume of CaOH= 0.0499/0.120= 41.5 mL
What is titration?
Titration, manner of chemical evaluation in which the amount of a few constituents of a sample is decided through including to the measured pattern an precisely acknowledged quantity of some other substance with which the preferred constituent reacts in a precise, acknowledged proportion. The procedure is generally finished via progressively adding a popular answer of titrating reagent, or titrant, from a burette,To know more about titration, click the link given below:
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which of the following statements about an e1 mechanism is not true? group of answer choices the reaction is fastest with tertiary alkyl halides a better leaving group makes the reaction rate increase the reaction follows first-order kinetics stronger bases favor the e1 reaction
d) stronger bases favor the E1 reaction statement about and E1 mechanism is not true
Ionization and deprotonation are typically the two stages involved in the E1 mechanism, also known as unimolecular elimination. The production of a carbocation occurs as an intermediate during ionisation. A proton is lost by the carbocation in deprotonation. SN1 and E1 Reactions have remarkably similar processes; the outcome just depends on whether the nucleophile or the base hits first. The pace of the reaction is solely dependent on the substrate in SN1/E1 reactions as opposed to second order SN2 and E2 reactions (see "SN2 Reactions" and "E2 Reactions").
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. In the past 150 years, CO2 emissions have risen by nearly 50%....
. In the past 150 years, CO2 emissions have risen by nearly 50%. What has dramatically increased during this time that has led to this increase in CO2? Explain how this has occurred.
Excessive burning of fossil fuels like coal, natural gas and oil has led to the increase of CO₂ level.
Definition of Fossil fuels
Fossil fuel is defined as a generic term for non-renewable energy sources such as coal, coal products, natural gas, derived gas, crude oil, petroleum products and non-renewable wastes. Fossil fuel are hydrocarbons which are formed from the dead remains of plants and animals that are buried under soil and are burned as fuel.
When fossil fuels are burned they give out harmful gases such as carbon dioxide due to its organic content which led to increase in the CO₂ level over the past years.
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Use the periodic table to determine the molar mass of each of the following elements. Each answer must have 2 decimal places.
Potassium (K): g/mol
Osmium (Os): g/mol
Manganese (Mn): g/mol
The molar mass of the Potassium, Manganese, and Osmium are 39.10 g/mol, 54.94 g/mol, and 190.23 g/mol, respectively.
What is the molar mass?The molar mass can be described as an average of many instances of the compound, which commonly varies in mass because of the presence of isotopes. In one mole, there are 6.023 × 10²³ atoms or molecules present in an element or compound respectively and this number is known as Avogadro’s number.
The molar mass of a compound is calculated by the sum of the atomic masses of each element in the molecule.
The molar mass can be defined as an intensive property. The S.I. unit of molar mass can be represented as kg/mol. Molar masses are always represented in g/mol.
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Answer:
39.10
190.23
54.94
Explanation:
Other answers r in images as well as an image of a cat
50 cm3 of sodium hydroxide solution was titrated against a solution of sulfuric acid. The concentration of the sodium hydroxide solution was 20 g/dm3. Work out how many moles there were in 50 cm3 of this solution.
The number of moles of the 50 cm³ of this solution is 1500.
The moles of sodium hydroxide required to neutralize 1 mole of sulfuric acid have been 2 mol.
The chemical equation for the titration of sodium hydroxide against sulfuric acid has been:
NaOH + H₂SO₄ → Na₂SO₄ + H₂O
The balanced chemical equation is
2NaOH + H₂SO₄ → Na₂SO₄ + H₂O
From the balanced chemical equation, for the titration of 1 mole of sulfuric acid, 2 moles of sodium hydroxide has been required.
The moles of sodium hydroxide required for the titration of sulfuric acid has been:
1 mol of H₂SO₄ = 2 mol of NaOH
the concentration of sodium hydroxide solution is 20 g/dm³.
volume = 50
With the above data we know that the volume of NaOH is 50 so the volume of H₂SO₄ is 25 and the total volume is 75 cm³.
We know that concentration = moles/ volume
Moles = concentration * volume
Moles = 20 * 75 = 1500
Therefore, the number of moles of the 50 cm³ of this solution is 1500.
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How many covalent bonds are predicted for an atom of chlorine?
Covalent bonds are predicted for an atom of chlorine = 1
Covalent bonds are made by sharing of electrons to complete the octet or doublet of the atom to attain stability.
Covalent bond refers to the mutual sharing of one or more pairs of electrons between two atoms.
These electrons simultaneously attract the atomic nuclei of the two atoms participating in the covalent bond.
A covalent bond is formed only when the electronegativity difference of two atoms is too small so that an electron transfer to form ions will not occur.
Number of bonds for a neutral atom = (Number of electrons in the complete valence shell i.e. 2 or 8 electrons) - (Number of valence electrons of the atom)
Number of bonds for chlorine = (Number of electrons in the complete valence shell i.e. 2 or 8 electrons) - (Number of valence electrons of the carbon)
which means,
Number of bonds for chlorine atom = 8 - 7
Number of bonds for chlorine atom = 1
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calculate the mass defect of the nitrogen nucleus 14 7n 714n . the mass mnmn of neutral 14 7n 714n is equal to 14.003074 atomic mass units.
Mass defect is defined by the difference in the isotopic mass and the atomic mass. The mass defect in the nucleus of the nitrogen atom is 0.11235 amu.
What is a mass defect?
The mass defect has been the difference between the actual and the predicted atomic mass of the elemental atom. The predicted mass is calculated by simply adding the number of neutrons and the proton present inside the nucleus. The actual mass of the atom has been seen to be less than the predicted atomic mass of the atom.
Mass of neutral nitrogen atom = 14.003074 amu
It is already known that,
Mass of protons = 1.00728 amu
Mass of neutrons = 1.0086 amu
Mass of electron = 0.000549 amu
The given element ¹⁴N₇ contains seven electrons, protons, and neutrons in its structure. The mass defect is calculated as:
= (7 × 1.00728) - (7 × 1.0086) - (7 × 0.000549) - 14.003074
= 0.11235 amu
Therefore, the mass defect in nitrogen is 0.11235 amu.
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primary amines can be converted into secondary amines by reaction with haloalkanes. this reaction is difficult to achieve in the lab because of the large number of byproducts. select the possible products or byproducts of the reaction.
primary amines can be converted into secondary amines by reaction with haloalkanes. this reaction is difficult to achieve in the lab because of the large number of byproducts. select the possible products or byproducts of the reaction.
The concept used to solve this problem is the knowledge of nucleophilic substitution reactions.
The Sn2 reaction or the bimolecular nucleophilic substitution reaction is a concerted type of reaction followed by the trigonal bipyramidal-shaped transition state which results in the formation of the product of inverted stereochemistry.
Fundamentals
Nucleophilic substitution reaction involves the primary attack of a nucleophile to the sigma square antibonding orbital of the carbon of alkyl halide, which in effect attach the nucleophile to that carbon and the removal of the halogen as a leaving group.
Attack of lone pair of nitrogen of substituted ammonia to the carbon-halogen bond of the halogen alkane. The initial attack is shown below.
Attack of the substituted ammonia acts as a base and abstracts proton from the alky ammonium halide salt to form the secondary amine. The attack of substituted ammonia is shown below
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There is a total of seventeen constitutional isomers for the molecular formula C5H13N. Draw the skeletal formula of all eight constitutional isomers that are primary amines.
There are seven structural isomers of 3-amines given the chemical formula C6H15N.
How many constitutional isomers may a molecule with the chemical formula C 2h 4cl 2 have?It might be put on the same carbon as the first chlorine atom, or it could be placed on the other carbon atom. As a result, the chemical formula C2H4Cl2 can have two isomers. Create and compare models of both isomers. It is vital to note that this molecule can only have two isomers.
This is sometimes referred to as 2° amine. C5H13N secondary amine has six isomers. Isomers are compounds that have the same molecular formula but a distinct structural formula.
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What is the value of 1 STP?
Answer:
There is no one value of 1 STP. STP stands for Standard Temperature and Pressure. Standard Temperature is [tex]0^{o}[/tex], and standard pressure is 1 atm.
Explanation:
The product of STP is literally ( [tex]0^{o}[/tex])*(1 atm) = 0 degree*atm, which has no real meaning.
Name the following aromatic hydrocarbon:
CH,CH;
CH,CH3
A. 1,4-dimethylbenzene
B. 1,4-dihexylbenzene
C. 2,6-diethylbenzene
D. 1,4-diethylbenzene
Answer:
A. 1,4-dimethylbenzene
Explanation:
The compound CH,CH;CH,CH3 is a benzene derivative with two methyl groups attached to the benzene ring. The positions of the methyl groups on the ring are indicated by the numbers 1 and 4, which correspond to the carbon atoms at the end of the two double bonds in the benzene ring. This compound is therefore 1,4-dimethylbenzene. The other options listed are not correct because they contain the wrong number or type of substituents on the benzene ring.
Is CH2O a formaldehyde?
Yes, the [tex] CH_{2}[/tex]O is the correct formula of formaldehyde.
The correct arrangement of bonds is H - C - H (=O). It is first aldehyde in the series and thus has only hydrogen atom attached to the aldehyde functional group. The valency of carbon is filled as two hydrogens form single bond and one oxygen is attached through double bonds with carbon.
Formaldehyde finds wide application in different fields as medicines, building and construction, food, manufacturing of sanitary products, disinfectants and many more. Produced by oxidation of methanol, it is a gaseous chemical with strong smell.
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what is the coordination number of cobalt in [co(nh3)5cl](no3)2? what is the coordination number of cobalt in [co(nh3)5cl](no3)2? 12 8 6 4 2
The coordination number of cobalt in [Co(NH3)5Cl](NO3)2 is 6.
What is coordination number?Coordination number is a term used in coordination chemistry to describe the total number of ligands attached to a single central atom in a compound. It is also known as ligancy or coordination number of a complex. The coordination number reflects the number of electrons available for bonding with the central atom. This number is determined by the number of sigma and pi bonds that the ligands form with the central atom. Typical coordination numbers range from two to nine, but higher numbers can occur in some cases. Coordination number is an important factor in determining the molecular structure and reactivity of a compound.
This is because there are five nitrogen atoms from the NH3 molecules that coordinate to the cobalt ion, one chlorine atom from the Cl- ion, and two oxygen atoms from the NO3- ion. This adds up to a total of six atoms coordinating to the cobalt ion.
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a certain mineral crystallizes in the cubic unit cell shown below. m represents the cations and a represents the anions. what is the empirical formula of the mineral?
The empirical formula of the mineral is MA
The simplest whole number ratio of atoms in a compound serves as the empirical formula for that compound. Sulfur monoxide and disulfur dioxide both have empirical formulas that are as straightforward as SO and S2O2, respectively. This provides a straightforward illustration of the idea. Thus, the empirical formula for the sulphur and oxygen compounds sulphur monoxide and disulfur dioxide is the same. The number of atoms in each molecule of a chemical compound is expressed by its molecular formula, which is different for the two substances. The arrangement. or number. of atoms. are not mentioned. in an empirical. formula. It is typical for numerous macromolecules, including silicon dioxide, as well as ionic chemicals like calcium chloride (CaCl2) (SiO2).
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given that you wished to use exactly 0.325 mole of nel/ to prepare a 2.50 m naci solution, how many milliters of solution must you prepare?
130 ml is milliters of solution must you prepare
What is Molarity?
Molality, also known as moles per kilogramme of a solvent, is the quantity of moles of a solute that may be found in a kilogramme of the solvent.
A mole is a unit of measurement for a chemical compound, and it is from this unit that the word "molarity" is derived
It is assessed by taking into account two indications, namely the volume of the solution and the quantity of solute molecules. Essentially, the volume of the solution is determined in litres. The letter "M" stands for molarity.
130 ml Molarity = moles/liter molarity
= 2.50 moles
= .325 2.5
= .325/liters solving this equation for liters: 2.5 * liters
= .325 liters
= .325/2.5 = 0.13 now a unit conversion from liters to the milliliter unit requested by the problem.
1 liter is 1000 milliliters .130l * 1000 ml/l
= 130 ml
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when holden goes to visit phoebe, how does she react to his arrival? how are the two similar and how are they different?
Catcher in the Rye is a young-adult fiction by J. Salinger. It is a novel based on the coming of the age and literary realism. Phoebe is disappointed with Holden's vindication.
Holden Caulfield is the protagonist and the narrator of the story who is intelligent but is expelled from the school. Phoebe is Holden's sister, she is infuriated by Holden's dismissal.
She knows that their father would be angry because Holden is expelled from school. Holden tries to explain his situation to his sister and tells her about his minimum chance of joining the military school.
He explains to her how bad is his school Pencey and he dislikes that place. But Phoebe interrupts him by saying that he doesn't like anything or anywhere.
Her challenge makes him think about the one thing that he likes the most and he couldn't. It shows Phoebe's concern to stimulate Holden. She is seen sympathetic and angry with her brother for not growing up.
Holden describes them in loving, caring terms, demonstrating his genuine affection and respect for them. How does Holden characterize Phoebe? Holden describes Phoebe as wise, overly affectionate at times, and overly emotional for her age.
Also as smart, tiny, and a little noisy. Holden, Phoebe, and Allie are siblings in the novel "The Catcher in the Rye." Holden looks up to his younger brother and sister as idealized versions of himself. Holden describes Allie as the most intelligent and pleasant member of his family.
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Explain how delta ΔT would be affected if a greater amount of surrounding solvent (water) is used, assuming the mass of salt remains constant?
Depression in the freezing point which means deltaT decreases as the mass of the solvent increases while the solute remains constant.
Molality is defined as the ratio of the number of moles of solute to the mass of solvent in kg. The molality is inversely proportional to the mass of the solvent. From the depression in freezing point, molality is in direct relation with the depression in the freezing point.
Therefore, depression in the freezing point which means deltaT decreases as the mass of the solvent increases while the solute remains constant.
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What is the potential of a cell made up of Zn?
The potential of a cell made up of is –0.7618.
ZnZn2+(aq) + 2e− ⇌ Zn(s)
Ecell = E cathode - E anode = 0.76V
The potential difference between two half cells of an electrochemical cell is measured as the cell potential, or Ecell. The capacity of electrons to go from one half cell to the other is what causes the potential difference. Because the chemical reaction is a redox reaction, electrons can travel between the electrodes. When one chemical is oxidised while another is reduced, a redox reaction takes place. The substance undergoes oxidation during which one or more electrons are lost, leaving it positively charged. On the other hand, the material picks up electrons during reduction and becomes negatively charged. This relates to the measurement of the cell potential because the difference between the potential of a cell for the reducing agent to get oxidised and the oxidizing agent to become reduced will determine the cell potential.
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Arrange the organic compounds from most soluble in water to least soluble in water. Most soluble in water CH4 CH, OH CH,OCH, Least soluble in water
On the basis of the polarity of the given compounds the order of the solubility in water is:
CH₃OH > CH₃OCH₃ > CH₄
What is solubility?Solubility can be defined as the maximum amount of Solute that can dissolve in a known amount of solvent at a specific temperature.
The solubility of the given compound depends upon the polarity of the compound. From the concept of like dissolves like therefore the polar compound is soluble in polar solvents and nonpolar compounds in nonpolar solvents.
Water is a polar solvent and CH₃OH is also a polar compound so it can form hydrogen bonding with water. Therefore it has the highest solubility in water. Methane is nonpolar it gas lowest solubility in water.
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Your question was incomplete, most probably the complete question was,
Arrange the organic compounds from most soluble in water to least soluble in water. Most soluble in water CH₃OH, CH₃OCH₃, and CH₄ Least soluble in water.
How do you predict a number?
Without letting me know, choose a number and then indicate the card or cards that it appears on.
I'll tell you the number you're thinking of!
Simply look at the top left corner of the cards and add the numbers (4 + 1), for instance, if someone chooses the number 5 and points to the two cards it appears on.
Any math lesson can benefit from the energy and amazement that math magic tricks bring to the subject. You can present them to kids as problem-solving exercises and give them the task of demystifying them so they become useful exercises for fostering critical thinking abilities. THOANs are perhaps the easiest to start with (Think Of A Number).
Question:
"How can I predict the next number in a non-obvious sequence?"
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Calculate the normal boiling point of chloroform given that the standard enthalpy of vaporization of chloroform is 31.4 kj/mol and the standard entropy of chloroform is 93.7 j/mol·k!
Given that it has a standard temperature of absorption of 31. 4 kJ/mole or a conventional efficiency of 93. 7 j/mole/K, the melting or boiling point of chloroform is 335.11 K.
What purpose does chloroform fulfill?Formaldehyde is a compound that aids in the dissolution of other chemicals, making it a solvent. In addition to being utilized in the construction, paper, and board sectors, it is also employed in the manufacturing of films and insecticides. It serves as a solvent for rubber as well as for polishes, floor polish, varnishes, adhesive, alkaloid, fats, and oils.
Given:Enthalpy of vaporization (H) = 31400 j/mole x 31.4 kJ/mole
Chloroform's entropy (S) = 93.7 j/mole.
Having said that,
ΔS = ΔH/T
T = ΔH/ΔS
T= 31400/93.7
T = 335.11K
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combine the PV = nRT and n = m/M to solve for molar mass, M.
what is this asking and how can I do it?
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used. Therefore, the combined formula is PVM=mRT.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature. Real gas behave like an ideal gas at low pressure and high temperature. There is no forces of attraction or repulsion between the particles of ideal gas.
The formula that comes by combining PV = nRT and n = m/M is
PV = nRT
PV =( m/M )RT
PVM=mRT
From this formula we can find the molar mass easily.
Therefore, the combined formula is PVM=mRT.
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Which is the correct statement regarding the relative Rf values of the starting methyl benzoate vs the product, methyl m-nitrobenzoate on a silica gel TLC plate. a. The product has a lower Rf value on a silica gel TLC plate because it is more polar than the starting methyl benzoate. b. The product has a lower Rf value on a silica gel TLC plate because it is less polar than the starting methyl benzoate. c. The product has a higher Rf value on a silica gel TLC plate because it is less polar than the starting methyl benzoate.d. The product has a higher Rf value on a silica gel TLC plate because it is more polar than the starting methyl benzoate.
The correct statement regarding the Rf values is as follows: a. the product has lower Rf value on silica gel TLC plate because it is more polar than starting material methyl benzoate.
Silica gel has lots pores with contains water, and we know that water is polar. So we can say that our stationary phase here silica gel is polar. In chemistry we say 'like dissolves like' therefore polar substance interacts with polar substances. If interaction is more than Rf value will be less. Rf value is nothing but the distance travelled by molecule on TLC plate. Here methyl m nitrobenzoate has nitro group which is polar in nature therefore it will interact with water in silica gel and she this it will travel less distance therefore Rf value is lower than methyl benzoate which does not interact with water in silica gel as it has no polar groups therefore runs faster and travels more distance hence the high Rf.
Therefore, the correct option is a.
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at a certain temperature the rate of this reaction is first order in with a rate constant of suppose a vessel contains at a concentration of . calculate how long it takes for the concentration of to decrease by . you may assume no other reaction is important. round your answer to significant digits.
1/8 of a second (2 significant figures). When this reaction occurs at a specific temperature, its rate is first order with a rate constant of let's say a concentration in a vessel.
What exactly is rate constant k?The proportionality constant (k) connecting the rate of the reaction to reactant concentrations determines the specific rate constant (SRC).
The reaction's equation is CICH2CH2Cl (g) --> CH2CHCI (g) + HCl (g)
Rate constant (k) equals 2.01 s-1
This is a first order reaction based on the rate constant's units.
Initial Concentration: 1.34 M t =
Final concentration equals 20 percent of 1.34, or 0.268 M.
First order reactions have the integrated rate rule ln[A] = ln[A]o - kt ln(0.268) = ln(1.34) - 2.01(t) -2.01(t) = - 1.6094 t = 0.8007 0.80 seconds (2 significant figures).
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a sealed cylinder fitted with a movable piston contains ideal gas at 27°c, pressure 0.500 × 105 pa, and volume 1.1 m3. what will be the final temperature if the gas is compressed to 0.800 m3 and the pressure rises to 0.820 × 105 pa?
Considering the combined law equation, the final temperature if the gas is compressed to 0.800 m³ and the pressure rises to 0.820×10⁵ Pa is 357.82 K.
Boyle's lawBoyle's law states that the pressure of a gas in a closed container is inversely proportional to the volume of the container, when the temperature is constant.
Mathematically, Boyle's law states that the product of pressure and volume always has the same value:
P×V= k
where:
P is the pressure.V is the volume.k is a constant.Charles' lawCharles' law states that the volume is directly proportional to the temperature of the gas when the pressure is constant.
Mathematically, Charles' law states that the ratio between volume and temperature always has the same value:
V÷T=k
where:
V is the volume.T is the temperature.k is a constant.Gay-Lussac's lawGay-Lussac's law states that the pressure of a gas is directly proportional to its temperature when the volume is constant.
Mathematically, Charles' law states that the ratio between pressure and temperature always has the same value:
P÷T=k
where:
P is the pressure.T is the temperature.k is a constant.Combined law equationCombined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:
(P×V)÷T= k
where:
P is the pressure.V is the volume.T is the temperature.k is a constant.Analyzing an initial state 1 and a final state 2, it is fulfilled:
(P₁×V₁)÷T₁= (P₂×V₂)÷T₂
Final temperature in this caseIn this case, you know:
P₁= 0.500×10⁵ PaV₁= 1.1 m³T₁= 27 °C= 300 K (being 0 °C= 273 K)P₂= 0.820×10⁵ PaV₂= 0.800 m³T₂= ?Replacing in the combined gas law:
(0.500×10⁵ Pa× 1.1 m³)÷ 300 K= (0.820×10⁵ Pa× 0.800 m³)÷T₂
Solving:
[(0.500×10⁵ Pa× 1.1 m³)÷ 300 K]× T₂= (0.820×10⁵ Pa× 0.800 m³)
T₂= (0.820×10⁵ Pa× 0.800 m³)÷ [(0.500×10⁵ Pa× 1.1 m³)÷ 300 K]
T₂= 357.82 K
Finally, the final temperature is 357.82 K.
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determine the empirical formula of a compound if 13.2 grams contains 6.509 grams of c, 0.9104 grams of h, and 5.780 grams of o?
The empirical formula is C3H5O2
what is empirical formula?
The lowest whole number ratio of atoms present in a compound is given by the most straightforward formula or empirical formula. This formula indicates the proportion of atoms of each element in the compound.
The number of moles of C (carbon), H (hydrogen), and O (oxygen) in the given compound is calculated as follows-
Number of moles of C = (mass of C) / (molar mass of C) = (6.509 g) / (12 g/mol) = 0.54 moles
The number of moles of H = (mass of H) / (molar mass of H) = (0.9104 g) / (1 g/mol) = 0.91 moles
The number of moles of O = (mass of O) / (molar mass of O) = (5.780 g) / (16 g/mol) = 0.36 moles
The mole ratio of C to H to O is determined as follows
-Moles of C: Moles of H: Moles of O = (0.54): (0.91): (0.36)
Dividing the number of moles by the smallest number of moles obtained, which is 0.36 as follows-
(0.54/0.36): (0.91/0.36): (0.36/0.36) = 1.5: 2.5: 1
The above ratio is multiplied by 2 in order to get a whole number ratio as follows-
(1.5 × 2): (2.5 × 2): (1 × 2) = 3: 5: 2
Hence, C: H: O = 3: 5: 2
This suggests that the empirical formula of the given compound will be C3H5O2.
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what is the empirical formula for perfluoropropane if the compound contains 81% fluorine and 19% carbon by mass?
The empirical formula for perfluoropropane is C3F8.
What is empirical formula?
A compound's empirical formula provides the simplest ratio of the number of various atoms present, but a molecule's molecular formula provides the precise number of each different element that is present.
The number of moles of carbon and fluorine is calculated from their respective molar masses:
Number of moles of the element= (Mass of the element)/ (Molar mass of the element)
The molar mass or the atomic mass of C is known to be 12.0107 g/mol
Thereby, the number of moles of C = (19 g) / (12.0107 g/mol)
= 1.5819 moles
The molar mass or atomic mass of F is known to be 18.998403 g/mol
The no. of moles of F = (81 g) / (18.998403 g/mol)
= 4.2635 moles
In the next step, divide the number of moles of elements that are obtained by the least number of the mole. In this case, the least number of moles is of carbon element.
Thereby, the corresponding calculation is as follows:
Simplest mole ratio of C= (1.5819 moles) /(1.5819 moles)
= 1
Simplest mole ratio of F= (4.2635 moles) /(1.5819 moles)
= 2.69
Therefore, the formula for the compound becomes CF₂.₆₉. But the formula is still not in the simplest whole-number ratio. Hence, to obtain the simplest whole-number ratio, both the subscripts can be multiplied by 3 as follows:
C1X3F2.69X3
= C3F8.07
=C3F8
Hence, the empirical formula of perfluoropropane is C3F8.
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a mixture of neon and oxygen gases at a total pressure of 652 mm hg contains neon at a partial pressure of 351 mm hg. if the gas mixture contains 2.34 grams of neon, how many grams of oxygen are present?
The grams of oxygen are present is 3.2 gram.
The partial pressure of an individual gas is same to the whole pressure improved with the aid of the mole fraction of that gas. because it is established completely on the wide variety of particles and no longer the identification of the gasoline, the correct fuel Equation applies just as well to combinations of gases because it does to pure gases.
Partial pressure is extremely essential in predicting the movement of gases. do not forget that gases generally tend to equalize their strain in two areas which are related. A gas will pass from a place in which its partial strain is higher to a place wherein its partial stress is lower
Calculation:-
Total pressure = 652 mm hg
partial pressure pressure of neon is = 351 mm hg.
pressure of oxygen is = 301 mm of Hg
mass of Oxygen = 2.34 grams
mole = 2.34/20
= 0.117
partial pressure = mole/total mole × total pressure
351 mm hg = 0.117 / total mole × 652
Total mole = (0.117 × 652 ) / 351
= 0.217
partial pressure of Oxygen = mole /total mole × total pressure
mole = (301 × 0.217)/ 652
= 0.1
mole = mass/molar mass
mass = mole × molar mass
= 0.1 × 32
= 3.2 gram
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Is polymorphism physical or chemical change?
To solve such, we must know the concept behind physical change and chemical change. Therefore, polymorphism is a physical change. Physical change is just opposite of chemical change.
What is chemical change?
Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same
One famous example of chemical change is the rusting of iron. The color, odor and arrangements of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature.
Polymorphism is the ability of the given chemical composition to crystallize in more than one form. Polymorphism is a physical change.
Therefore, polymorphism is a physical change.
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hydrogen peroxide (h2o2) is a major industrial chemical that is produced on a scale approaching 109 kg per year. it is widely used as a bleach and in chemical manufacturing processes. how do you expect its boiling point to compare with those of fluorine (f2) and hydrogen sulfide (h2s), two substances with molar masses comparable with that of hydrogen peroxide?
Hydrogen peroxide is a colorless liquid at room temperature with a bitter taste. Small amounts of gaseous hydrogen peroxide occur naturally in the air.
Since it easily breaks down into oxygen and water and releases heat, hydrogen peroxide is unstable. Despite not being flammable, it has a strong oxidising agent that, when in contact with organic material, can trigger spontaneous combustion. For medical purposes, as well as for usage as a clothing and hair bleach, hydrogen peroxide is present in many homes in low amounts (3–9%). Higher quantities of hydrogen peroxide are employed in the manufacturing of organic compounds, foam rubber, and rocket fuels in addition to being utilised as a bleach for paper and textiles.
With disinfecting, antiviral, and antibacterial properties, hydrogen peroxide is a peroxide and oxidising agent. Hydrogen peroxide's oxidising activity manifests itself upon topical administration, rinsing, and generation of free radicals, which causes oxidative damage to proteins and other biological molecules.
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we cannot specify how long an individual radioactive isotope will survive before it decays, but we can measure how long it takes for a population of the parent isotopes to be halved. this is a consequence of half of the parent isotopes decaying into daughter isotopes. this time unit is called the half-life of the isotope. for a given radioactive element, the half-life is a constant regardless of conditions. q19 the ratio of parent-to-daughter isotopes changes with the passage of each successive half-life. how many of the original atoms of a parent isotope remain unchanged after five half-lives? group of answer choices 1/4 1/8 1/16 1/32
A quantity of the original isotope (18) is kept. A particular radioactive isotope's half-life is constant; it is unaffected by environmental factors and is unrelated to the starting concentration of that isotope.
How does radioactive decay affect the parent isotopes?These isotopes emit alpha, beta, and gamma rays as a result of their radioactive decay. A decay chain starts with a parent isotope.
What exactly is an isotope's daughter?The radioactive decay of parent isotopes yields daughter isotopes. Although reactions occasionally produce stable daughter isotopes, they are typically unstable and radioactive, which promotes the progression of decay chains.
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