The concentration of the diluted solution will be 0.017 M
It asks you to find the concentration, which is the safe to assume that the unit is Molarity (M). Also, the unit was used in the problem as well.
Molarity has the units of moles/L so we have to work on getting to this point.
The problem states that you have the 10.8 mL of a 6.60 M concentration. First, we will need moles. To get the moles, we use stoichiometry,
10.8 mL = 0.0108 L
0.00108 L x ( 6.6 moles/ L) = 0.07128 moles
0.00108 L x ( 6.6 moles/ L) = 0.07128 moles
This is how many moles are present inside the solution.
To find the new concentration, we divide the total number of moles by the new volume in the Liters:
0.07128 moles/0.25L = 0.01782 M
Rounding to two significant figures, we get 0.017 M.
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the gas in a 250.0 ml piston experiences a change in pressure from 1.00 atm to 3.45 atm. what is the new volume (in ml) assuming the moles of gas and temperature are held constant?
The new volume (in ml) assuming the moles of gas and temperature are held constant is 72.4 ml.
What is pressure?
A barometer or manometer can be used to measure pressure, which is the force applied per unit area. For an accurate physical description of a sample of a gas, four variables must be known: temperature, volume, quantity, and pressure. The SI unit for pressure is the pascal (Pa), which equals one newton per square meter (N/m²) of surface area. Pressure is defined as force per unit area of surface. An object's pressure is inversely proportional to the area on which the force is applied, and it is proportional to the force it exerts.
We have,
At constant temperature = P₁V₁ = P₂V₂
Where,
Initial pressure, P₁ = 1.00 atm
Final pressure, P₂ = 3.45 atm
Initial volume, V₁ = 250 ml
Final volume, V₂ = ?
Putting values in the formula
=(1.00 atm) × (250ml) = (3.45 atm) × V₂
V₂ = 72.4 ml
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Malonyl-CoA is an intermediate in fatty acid synthesis. It also regulates fatty acid metabolism. Which of the following molecules regulate the enzyme that catalyzes malonyl-CoA synthesis? a. fatty acids or fatty acyl-CoA b. carnitine c. oxaloacetate d. acetyl-CoA e. citrate Which of the following enzymes does malonyl-CoA regulate? a. ATP-citrate lyase b. carnitine acyltransferase c. acetyl-CoA carboxylase
d. fatty acid synthase e. acyl-CoA dehydrogenase
Malonyl-CoA is an important intermediate in fatty acid synthesis and is essential for regulating fatty acid metabolism. It is synthesized from acetyl-CoA, which is the end-product of the citric acid cycle and a major energy source for cells.
Which of the following molecules regulate the enzyme that catalyzes malonyl-CoA synthesis? Option D. Acetyl-CoAAcetyl-CoA is the molecule that regulates the enzyme that catalyzes malonyl-CoA synthesis. Acetyl-CoA is the end-product of the citric acid cycle and is a major source of energy for cells. It is also the starting point for fatty acid biosynthesis. Acetyl-CoA is used to synthesize malonyl-CoA, which is then used in the elongation of fatty acids. Acetyl-CoA is the molecule that activates the enzyme involved in fatty acid synthesis, acetyl-CoA carboxylase, which is responsible for the conversion of acetyl-CoA to malonyl-CoA. Therefore, acetyl-CoA is the molecule that regulates the enzyme that catalyzes malonyl-CoA synthesis.
Which of the following enzymes does malonyl-CoA regulate? Option C. Acetyl-CoA carboxylaseMalonyl-CoA regulates the enzyme acetyl-CoA carboxylase, which is responsible for the conversion of acetyl-CoA to malonyl-CoA. Acetyl-CoA carboxylase is an enzyme that catalyzes the formation of malonyl-CoA from acetyl-CoA, which is the starting point for fatty acid synthesis. Malonyl-CoA is then used in the elongation of fatty acids. Therefore, acetyl-CoA carboxylase is the enzyme that malonyl-CoA regulates.
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100. ml of 0.200 m hcl is titrated with 0.250 m naoh . part a what is the ph of the solution after 50.0 ml of base has been added? express the ph numerically.
The ph numerically is 7.00.
What is ph?
Measure of an aqueous solution's basicity or acidity in numbers. The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 1014 gram-equivalents per litre, into numbers between 0 and 14.
What is titration?
A exact amount of a different substance—one that the desired constituent reacts with in a specific, known proportion—is added to the sample under test in the process of titration, a type of chemical analysis, to determine how much of each constituent is present.
moles HCl = 0.100 L x 0.200 M = 0.0200
moles NaOH = 0.0500 L x 0.250 M=0.0125
moles HCl in excess = 0.0200 - 0.0125 =0.00750
total volume = 0.150 L
[H+]= 0.00750/ 0.150L=0.0500 M
pH = - log 0.0500=1.30
at the equivalence point moles H+ = moles OH- so pH = 7.00
Therefore, the ph numerically is 7.00.
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What does half-life of 4 hours mean?
The duration needed for a drug's active ingredient to halve in your body is known as the half-life.
The duration needed for a drug's active ingredient to halve in your body is known as the half-life. According to how the body breaks down and eliminates the substance, this will happen. It can range from a few of hours to a couple of days, or even a couple of weeks. It may be possible for you to switch to a similar drug with a longer half-life if you are on a short-half-life medication and experiencing withdrawal symptoms. This medication with a longer half-life might be simpler to stop taking.
The duration of a drug's half-life can also serve as a reference for how long it will take for your body to adjust to its first dose and reach a steady level. It will typically take around.
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9. What is the balanced formula equation for the reaction shown in the figure?
a. H2 + Br2 ---> 2HBr
b. 2H + 2Br ---> 2HBr
c. H2 + B2r ---> H2Br2
d. H2 + Br2 ---> HBr + HBr
10. Identify the product(s) in the chemical equation H2 + Br2 ---> HBr
a. hydrogen only
b. both hydrogen and bromine
c. hydrogen and bromine only
d. both bromine and hydrogen bromide​
a given sample of n2 gas has a pressure of 0.30 atm at 30.0 °c. if the volume is 2.0 l, how many moles of n2 are present?
A given sample of n2 gas has a pressure of 0.30 atm at 30.0 °c. if the volume is 2.0 l, then moles of n2 are present is 0.002.
PV=nRT
n=PV/RT
n=0.30×2÷0.82×298
n=0.6/244
n=0.002 mol
The mole concept is a helpful way to quantify the amount of a substance. When dealing with particles at the atomic (or molecular) level, it is known that even one gramme of a pure element contains an enormous number of atoms. The mole concept is frequently used in this context. The most popular unit of measurement is the "mole," which is a count of a significant number of particles. The number 6.02214076*1023, also known as the Avogadro constant, is frequently denoted by the letter "NA". Among the elementary entities that can be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).
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Why does atomic radius increase across Period 3?
An atomic radius decrease across Period 3 because the number of shells not increases but the number of electron increases and the atomic size decreases as the effective nuclear charge increases.
When we move in the period 3 from left to the right the atomic radius decreases because of the reason that the the number of shells don not change they will remain the same across the period but the number of the electron will increases . the effective nuclear charge will also increases. the nucleus will attract the electrons more strongly that the reason the atomic radius decreases.
Thus, number of electron increases and the number of shells will remain same , the atomic size decreases as the effective nuclear charge increases.
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What are bonds example?
Some Examples of primary bonds such as ionic bond,covalent bond and metallic bond;
-Example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom
-Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.
-Metallic bonding, is especially common in minerals involving transition metals. Gold, silver, and copper are examples of minerals with metallic bonds.
Chemical Bond and its type :-
A chemical bond is a lasting attraction between atoms or ions that enables the formation of molecules and crystals. The bond may result from the electrostatic force between oppositely charged ions as in ionic bonds, or through the sharing of electrons as in covalent bonds. The strength of chemical bonds varies considerably; there are "strong bonds" or "primary bonds" such as covalent, ionic and metallic bonds, and "weak bonds" or "secondary bonds" such as dipole–dipole interactions, the London dispersion force and hydrogen bonding. Strong chemical bonding arises from the sharing or transfer of electrons between the participating atoms.
There are three primary types of bonding: ionic, covalent, and metallic.
An ionic bond is formed when valence electrons are transferred from one atom to the other to complete the outer electron shell.
A covalent bond is formed when the valence electrons from one atom are shared between two or more particular atoms.
A metallic bond is formed when the valence electrons are not associated with a particular atom or ion, but exist as a "cloud" of electrons around the ion centres.
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a. your instructor had transposed two numbers when reading the pressure and reported the barometric pressure was 745 torr when in fact the correct room pressure was 754 torr?
In this case mass of the pressure used for the calculation (745 torr) is less than the correct room temperature (754 torr).
What is barometric pressure ?
The measurement of atmospheric pressure, more particularly the weight of air molecules at a given location on Earth.
What is pressure ?
Divided by the surface area of the wall, the total force of all gas particle/wall collisions: One of the basic measurably present quantities of this phase of matter, pressure, is an effect that all gases have.
In this case, mass of the pressure used for the calculation (745 torr) is less than the correct room temperature (754 torr). This will lead to lower calculation of mass being present for Mg metal, since the pressure is 9 torr less than the actual pressure.
Therefore, in this case mass of the pressure used for the calculation (745 torr) is less than the correct room temperature (754 torr).
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octahedral complexes has two more unpaired electrons in the high-spin configuration than in the low-spin configuration?
The example of this octahedral complex which has two more unpaired electrons in the high spin configuration than in the low spin configuration is Cobalt (II) or Co2+.
What are Octahedral complexes?
Octahedral complexes are coordination complexes with an octahedral molecular geometry. This geometry is characterized by six ligands attached to a central metal atom at the corners of an octahedron. Octahedral complexes are often used as catalysts in industrial processes, and they are also found in biological systems. The ligands can be either anionic, neutral, or cationic, and the central metal atom can be any of the transition metals from groups 3-12 of the periodic table. Octahedral complexes are often described in terms of their electron configuration, which is determined by the number of electrons in the ligands and the central metal atom. These complexes are important in many areas of chemistry, including inorganic, physical, and organometallic chemistry.
Octahedral complexes contains 6 ligands. The hybridization can be d2sp3 or sp3d2.
There are two types of spin complexes
High spin complexes: When Δo>PLow spin complexes: When Δo< PFor more information refer the attached file below
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What does phosphate do to chlorine?
The efficiency of chlorine is hampered by phosphates, which also indirectly raise chlorine demand.
Because of this, our third pillar of proactive pool maintenance is the removal of phosphates to maintain their levels below 500 ppb (g/L). Because they weren't always a problem, phosphorus in pool chemistry is a misunderstood problem.
Phosphates are chemical substances that are frequently found in water and are formed of phosphorous and oxygen. PO4, also referred to as orthophosphate, is the most prevalent basic phosphate unit. Phosphates can be produced from phosphoric acid as salts or esters, to put it simply. Phosphates are important in swimming pools because they provide food for pollutants like algae to reproduce.
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how many electrons are in a antibonding molecular orbitals based on the molecular orbital diagram for o2 given that each o electron configuration is 2s22p4 do include electrons from the 1s shell in your count
Oxygen has an electron configuration of 1s22s22p4. In order to accommodate the twelve valence electrons in O2, molecular orbitals must be large enough. two electrons in orbitals that are antibonded.
Due to less electron-electron repulsion (Hund's Rule), each of these electrons is in a different orbital. The Molecular Orbital theory encompasses the idea of bonding and antibonding electrons, thus we will first discuss the theory. Molecular oxygen has a bond energy of 498 kJ/mole. Given that oxygen possesses two electrons in an antibonding orbital as opposed to nitrogen's single electron, it is not unexpected that this is less than the 945 kJ bond energy of N2. The dioxygen molecule's two unpaired electrons give this material a peculiar and defining characteristic: O2 is paramagnetic.
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what is the order of decreasing atomic radius? 1. chlorine, silicon, sulfur 2. silicone, sulfur, chlorine 3. chlorine, sulfur, silicon 4. sulfur, silicon, chlorine 5. sulfur, chlorine, silicon 6. silicon, chlorine, sulfur
As atomic length decreases on transferring alongside a period, the atom with biggest atomic radius is silicon, then sulfur observed with the aid of using chlorine which has the smallest atomic radius.
The periodic table, atomic radii lower from left to proper throughout a row and boom from pinnacle to backside down a column. Because of those trends, the most important atoms are determined withinside the decrease left nook of the periodic table, and the smallest are determined withinside the higher proper nook (They are in Group 16, 17, and 14 respectively.
As atomic length decreases on transferring alongside a period, the atom with biggest atomic radius is silicon, then sulfur observed with the aid of using chlorine which has the smallest atomic radius.
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computational chemistry calculates physical and chemical properties of compounds based upon
Computational chemistry uses methods of theoretical chemistry, incorporated into the computer programs, to calculate structures and properties of molecules, groups of molecules, and the solids.
A subfield of chemistry called computational chemistry makes use of computer modeling to help solve chemical issues. It is crucial since the quantum many-body issue cannot be analytically solved, much less in closed form, with the exception of very recent results pertaining to the hydrogen molecular ion. While computational findings typically supplement the knowledge gained from chemical experiments, they can occasionally forecast previously unknown chemical processes. It is widely employed in the development of novel materials and medications.
Structure, or the predicted positions of the constituent atoms, absolute and relative (interaction) energies, electronic charge density distributions, dipoles and higher multipole moments, vibrational frequencies, reactivity, or other spectroscopic quantities, and cross sections for collision with other particles are examples of these properties.
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which molecular orbital has zero nodes, contributes to bonding, and has nonzero electron density directly along the internuclear axis?
An entirely bonded molecular orbital has non-zero electron density, no nodes, and is perpendicular to the internuclear axis.
Molecular orbital-Molecular orbitals are linear combinations of atomic orbitals that represent the electron distribution across two or more atoms. A molecular orbital is the orbital or wavefunction of an electron in a molecule.
A mathematical function termed a molecular orbital describes the position and wave-like behavior of an electron inside a molecule.. You can compute chemical and physical attributes using this function. Electrons in the vicinity of a molecule can be associated with multiple atoms and are frequently expressed as a combination of atomic orbitals.
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Using standard heats of formation, calculate the standard enthalpy change for the following reactions.
a. Fe3O4(s)+4H2(g)→3Fe(s)+4H2O(g)
b. C(s,graphite)+O2(g)→CO2(g)
c. NH2Cl(aq)→NH3(g)+HCl(aq)
The reaction between CH4(g) + 2O2(g) and CO2(g) + 2H2O(l) results in an enthalpy change of -891 kJ/mol.
When given the temperatures of formation, how can we determine the standard enthalpy change?The standard enthalpy change of formation, in this equation, is defined as the product of the standard enthalpies of formation of the reactants and the sum of the standard enthalpies of formation of the products. Along with the data for the normal formation enthalpy: H fo[A]=433 KJ/mol. H fo[B] = -256 KJ/mol. The reaction enthalpy can be calculated by subtracting the sum of the enthalpies of all the reactants from the sum of the enthalpies of the products. By subtracting the sum of the enthalpies of the reactants from the total enthalpies of the product, we may get the thermodynamic constant, or tH.To learn more about Enthalpy change refer to:
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the mass of a nitrogen molecule is 14 times greater than that of a hydrogen molecule. what is the temperature of a sample of hydrogen whose average molecular energy is equal to that in a sample of nitrogen at 300 k?
The kinetic strength of one mol of nitrogen molecules at three hundred K is 3741.3 Joules.The KE is 41 kj.
We recognize that,Kinetic strength ∝ TIn the question, temperature is equal in each conditions. So, the kinetic strength withinside the 2d situation is E.Room imply rectangular velocity is given by
vrms=√3RTM
Here,M= Molar mass of fueloline moleculeT= temperature of the fueloline moleculeWe have given VN2=VH2
∴√3RTN2MN2=√3RTH2MH2
⇒TH22=57328⇒TH2≈41 K
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What mass of Na2SO4 is produced if 49 gram of H2SO4 reacts with 80 gram of NaOH?
71 g of Na2SO4 is produced if 49 gram of H2SO4 reacts with 80 gram of NaOH
Given that;
Mass of Na2SO4 is 49 gram
Mass of NaOH is 80 gram
To find number of mol we have to find molar mass of each element ;
Molar mass of Na2SO4 = 98 g/mol
Molar mass of NaOH = 40 g/mol
So, Number of mol(n) of Na2SO4 = 49/98
n(Na2SO4) = 0.5 mol of H2SO4
Number of mol(n) of NaOH = 80/40
n(NaOH) = 2 moles of NaOH
According to the balanced chemical reaction ; H2SO4 + 2 NaOH –––> Na2SO4 + 2 H2O one mol of H2SO4 react with 2 mol of NaOH to form 1 mol of Na2SO4, same as 0.5 mol of H2SO4 react with 1 mol of NaOH to form 0.5 mol Na2SO4
H2SO4 + 2 NaOH –––> Na2SO4 + 2 H2O
(1) .. .. .. .. (2) .. .. .. .. .. .. (1) .. .. Then,
(0.5) .. .. .. (1) .. .. .. .. .. .. (0.5)
H2SO4 is the limiting and NaOH is the excess reagent.
So,0.5 mol of Na2SO4 is formed .
Mass of Na2SO4 = mol of Na2SO4 × molar mass of Na2SO4
Mass of Na2SO4 = 0.5 × 142
Mass of Na2SO4 = 71 g of Na2SO4
So, 71 g of Na2SO4 will produced
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elect True or False for each statement: The solubility of gases in water decreases with increasing temperature Most solids are more soluble at higher temperature. Pressure has little effect on the solubility of liquids and solids because they are almost incompressible.
True, The solubility of gasses in water decreases with an increase in temperature.
What is solubility?
A substance's solubility is the greatest amount that will dissolve in a given amount of solvent at a given temperature. A specific solute-solvent combination's solubility is a defining trait, and the solubility of various compounds can vary significantly.
When temperature rises, molecules' vibrational kinetic energy increases, breaking intermolecular bonds and allowing gases to escape from the solution, the solubility of gases in water is inversely proportional to temperature.
Hence, the solubility of gasses in water decreases with increase in temperature.
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How many total electrons must be transferred to form one formula unit of the compound al2o3?.
Six electrons are transferred in the formation of Al₂O₃.
Aluminum metal and Oxygen react to form Al₂O₃ as,
2 Al + 3/2 O₂ → Al₂O₃
Oxidation number of Al on left hand side is zero, while than on right hand side in Al₂O₃ is +3.
It means it has lost 3 electrons per one atom and six electrons per two atoms. Also, the oxidation number of O at left hand side in O₂ is zero, while that in Al₂O₃ it is -2 per atom and -6 per 3 atoms.
So, two Al atoms have lost 6 electrons and 3 O atoms have gained six electrons.
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Answer:
6
Explanation:
Al has a left-side oxidation number of zero and a right-side oxidation number of three. means that it has lost three electrons for every single atom and six for every two atoms. Additionally, the left-hand side of O2 has an oxidation number of zero, whereas Al2O3 has an oxidation number of -2 per atom and -6 per three atoms. Thus, three O atoms have received six electrons whereas two Al atoms have lost 6 electrons.
term a client with a serum sodium level of 125 meq/ml should benefit most from the administration of which intravenous solution? a. 0.9% sodium chloride solution (normal saline) b. 0.45% sodium chloride solution (half normal saline) c. 10% dextrose in 0.45% sodium chloride d. 5% dextrose in 0.2% sodium chloride
The administration of 0.9% sodium chloride solution will be most beneficial for a patient with a blood sodium level of 125 meq/ml (normal saline).
The patient has hyponatremic hyponatraemia (normal range for serum sodium is 135–145 mEq/mL or mmol/L). In comparison to 0.45% sodium chloride solution (half normal saline), 10% dextrose in 0.45% sodium chloride, and 5% dextrose in 0.2% sodium chloride, 0.9% sodium chloride solution or normal saline offers the most sodium. All hypotonic fluids contain sodium chloride, sometimes known as saline. The sodium chlorine content of hypotonic fluids is lower than that of isotonic and hypertonic IVs. In light of this, these solutions are applied to patients who exhibit hypernatremia or excessive sodium chloride levels. Patients with fluid volume deficiency are treated with isotonic solutions (also known as hypovolemia) to raise their blood pressure.
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a 3.5kg object is accelerating at 2.2m/ while being pushed by a force of 10 n to the right across the floor
The next external force exerted on the papaya is 7.7 N.
What is force?Force is the power that changes the motion of the object. The external force that accelerated the papaya across the table must be resolved in this problem. We can solve the external force by applying the idea of Newton's first law of motion.
F = ma
where
F is the force, the unit is in Newtons (N)
m is the mass, the unit is in kg
a is the acceleration, the unit is in m/s²
Given that, m = 3.5 kg
a = 2.2 m/s²
F = ?
F = ma
Substitute the given data
F = (3.5 kg) (2.2 m/s²)
F = 7.7 N
Therefore, the external force of the papaya is 7.7 N.
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The question is incomplete. Your most probably complete question is given below:
What is the next external force exerted of the papaya?
Minerals or organic matter carried and deposited by water or wind that may consolidate into rock.
a. True
b. False
It is true that minerals or biological stuff can be transported by the wind or water, where they are then deposited and may solidify into rock.
What minerals exist in organic material?There are also elemental carbon minerals like graphite and diamond, as well as carbides, simple carbon oxides like carbon monoxide and carbon dioxide, carbonates, cyanides, and other carbon compounds. Often forming crusts over cracks, organic minerals are uncommon and difficult to locate. Mineral, biological, or pre-existing rock grains that can be carried by water, wind, or ice are classified as sediment. Sedimentary rock is defined as rock that forms at or very close to the Earth's surface as a result of the consolidation of loose sediment that has gathered due to wind, water, or glacier deposition.To learn more about Mineral refer to:
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Which model could represent a neutral atom of boron?
A. 4
B. 3
C. 1
D. 2
Answer: The option B. 3 is the answer.
Explanation:Boron has an Atomic mass of 11 and 5 protons and 6 Neutrons.
The Electrons are also in the correct positions to be a boron atom.
What are the effects of chemical exposure?
The effects of chemical exposure includes difficulty in breathing and blistering of skin.
Well we are working in a laboratory, there are a few certain ways in which a harmful chemical can harm us.
For an example, if any chemical is easily evaporated at the room temperature then there is a very high possibility that we may inhale the chemical along with air into our lung which make create difficulty in breathing.
Also some chemicals like concentrated hydrochloric acid or concentrated Sodium Hydroxide are the chemicals which can produce blistering of skin when they come in contact with the human skin.
The above stated effects are the consequences of chemical exposure.
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50 cm3 of a gas were collected during a reaction. The reaction was carried out at room temperature and pressure. How many moles of the gas were collected? give your answer to 3 decimal places.
The moles of gas collected during the reaction carried out under normal conditions of pressure and temperature and occupying a volume of 50 cubic centimeters were 0.002 moles.
Calculation of moles of gasTo calculate the number of moles of gas that were collected, the ideal gas formula PV = nrt is used
Procedure to calculate the number of moles of gasAssuming the normal conditions of temperature and pressure, we have the following data
n = ?
V = 50 cm3 = 0.05 L
R = 0.082 L atm / mol °K
t = 25°C = 298°K
P = 1 atm
n = PV / Rt
n = 1 x 0.05 / 0.082 x 298
n = 0.05 / 24,436
n = 0.002 mole
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chemical combination of two or more atoms that form a specific chemical compound
A molecule is a chemical compound that is created when two or more atoms are combined. Water is an illustration of a molecule (H2O H 2 O ).
Which of the following pairs of atoms, when combined chemically, results in a particular chemical compound?A structure made up of two or more atoms that are chemically connected to one another is called a molecule. A compound or elemental molecule could be the structure.
What is a substance created chemically when two or more elements are combined in specific ratios?Two or more elements are mixed in specific amounts and precise proportions through chemical bonding to form compounds. A substance is a pure form of matter that cannot be physically separated from or refined further.
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Question:-
Which of the following is a chemical combination of two or more atoms that form specific chemical compound?
explain why real molecules like water and ammonia have bond angles of 104.5o and 107o instead of 109.5o.
Answer:
This is because of the lone pairs present in the molecules. Bond and lone pairs of electrons have maximum mutual repulsion but lone pairs of electrons have a stronger mutual repulsion than bond pairs thus creating a bent or v shape in water and trigonal pyramidal shape in ammonia.
There are 4 pairs of electrons in water. if all were bond pairs then the bond angle would be 109.5 but because of the the two lone pairs you take away 2.5 per lone pair from 109.5. Same goes to ammonia if they were all bond pairs then it would be 109.5 but because of the one lone pair it becomes 107.
Explanation:
A sample of gas weighs 3.33 g and occupies a volume of 1.365 l at 95 °c and 790 torr. identify the gas sample.
a. Cl2 (molar mass 70.90 g/mol)
b. NH3 (molar mass 17.03 g/mol)
c. N2O (molar mass 44.02 g/mol)
d. CHCls (molar mass 119.4 g/mol)
e. SO2 (molar mass 64.07 g/mol)
The gas sample is of chlorine gas.
The weight of the gas sample is 3.33 grams and it occupies a volume of 1.365 l at 95 degrees Celsius. The pressure is 790 torr.
The ideal gas equation is,
PV = (W/M)RT
Where,
P is the pressure of the gas,
V is the volume of the gas,
W is the weight of the gas
M is the molar mass of the gas,
R is the gas constant,
T is the temperature of the gas.
Putting values,
790 x 1.365 = (3.33/M)62.36 x 368.15
Solving to get the value of M,
M = 70.89 g/mol.
This is near to the mass of the gas Cl₂.
So, the gas is chlorine.
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gaseous methane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . suppose 13. g of methane is mixed with 99.0 g of oxygen. calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. be sure your answer has the correct number of significant digits.
The mass of the carbon dioxide that could be produced by the chemical reaction is 11.68 gram.
In Any chemical reactions involving multiple reactant species one of the reactants present has an initial molar quantity that does not satisfy the necessary stoichiometry of the balanced reaction equation. If the reaction proceeds to completion, then this limiting reactant is fully consumed.
The balanced complete combustion reaction equation of methane is,
CH4 + 2 O2 ---> CO2 + 2H20
Mass of methane reactant = 13g
Moles of methane reactant = 13g * 1 mole/ 16.0 gram = 0.81 mole
Mass of oxygen reactant = 99g
Moles of oxygen reactant = 99g * 1 mole/ 32.0gram = 3.093 mole
According to the balanced equation oxygen is the limiting reactant. Therefore methane is the excess reactant. Some of its quantity remains after complete reaction.
Moles of methane reactant remaining= 0.81 mole - 3.093/2 mole
= 0.73 mole
Mass of methane reactant remaining = 0.73 mole * 16.0gram /1 mole
= 11.68 gram
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