answer the question.........
mb wrg subject but its biology

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.

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.

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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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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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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Molecular formula of a compound is C₆H₁₂O₆.

Let's find the Molar mass of Carbon=12.

Molar mass of Hydrogen=1.

Molar mass of Oxygen=16.

Mass of CH₂O =12+2(1)+16=30.

Molecular weight of the compound given is 180.

So, the molecular weight is  180/30 =6.

⇒ Molecular formula of a compound is C₆H₁₂O₆.

What is the molecular formula of the empirical formula CH2O?

The molecular formula of an organic molecule with a molar mass of 60 grams per mole and an empirical formula of CH2O is C2H4O2.

What is the molecular weight of CH2O?

30.031 g/mol

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.

The reaction 2CO+O₂ → 2CO₂ is a combustion as well as combination reaction.

The balanced chemical equation of the reaction of carbon monoxide with Oxygen gas to produce carbon dioxide is given as,

2CO+O₂ → 2CO₂

As you can see from the above reaction carbon monoxide is getting combusted because of the presence of Oxygen gas to produce carbon dioxide. So, we can say this is a combustion reaction.

Also as we can see that carbon monoxide and Oxygen gas is combining to produce carbon dioxide so we can say that it is a combination reaction as well.

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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.

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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The molar mass of the Potassium, Manganese, and Osmium are 39.10 g/mol, 54.94 g/mol, and 190.23 g/mol, respectively.

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

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.

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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Two objects are placed a certain distance from each other. The amount of gravitational force between the two objects depends on their masses and the distance between them. As the masses of the objects decrease, the force of gravity between them increases. As the distance between the objects decreases, the force of gravity between them decreases.

Gravitational force is defined as the force of attraction that a body of mass M, exerts on another body that is found within its region of space that this force acts.

The law of gravitational attraction states that the gravitational force of attraction between two bodies of masses m₁ and m₂ is directly proportional to the product of their asses and inversely proportional to the square of the distance between them, r.

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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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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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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.

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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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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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.

These isotopes emit alpha, beta, and gamma rays as a result of their radioactive decay. A decay chain starts with a parent isotope.

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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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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There are seven structural isomers of 3-amines given the chemical formula C6H15N.

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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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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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 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:

Charles' 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:

Gay-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:

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

(P×V)÷T= k

where:

Analyzing an initial state 1 and a final state 2, it is fulfilled:

(P₁×V₁)÷T₁= (P₂×V₂)÷T₂

In this case, you know:

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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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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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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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.

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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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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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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When gaseous CFCs gradually ascend into the stratosphere, are broken down by potent ultraviolet light, release chlorine atoms, and then interact with ozone molecules, they can reduce the amount of ozone in the atmosphere. ) in the form of aerosol (see Ozone Depleting Substance.

Because Cl and ClO are generated every time the reaction cycle is finished and are thus available for additional ozone destruction, chlorine is thought of as a catalyst for ozone degradation. O3 and O2 molecules react with solar ultraviolet (UV) radiation to produce atomic oxygen.

Molina discovered that chlorofluorocarbons (CFCs) might destroy the ozone layer in the Earth's atmosphere, which shields the planet from the sun's harmful UV rays.

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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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The concentration of the weak base that would produce a pH of 10.14 is 1.5 * 10^15 M.

Let us recall that the Kb is simply the base dissociation constant. This is the equilibrium constant that would  tell us how much of the base has been dissociated in the solution.

In this case, we can be able to write the equation of the dissociation of the base in the following way;

[tex]BH^+[/tex](aq) + [tex]H_{2} O[/tex](l) -------> [tex]B^-[/tex](aq) + [tex]H_{3} O^+[/tex](aq)

Kb = [ [tex]B^-[/tex]] [ [tex]H_{3} O^+[/tex]]/[[tex]BH^+[/tex]]

But [ [tex]B^-[/tex]] = [ [tex]H_{3} O^+[/tex]] = Antilog (-10.14)

= 7.2 * 10^-11 M

Thus;

7.80 × 10^−7 = (7.2 * 10^-11)^2/[[tex]BH^+[/tex]]

[[tex]BH^+[/tex]] = 7.80 × 10^−7/(7.2 * 10^-11)^2

[[tex]BH^+[/tex]] =   7.80 × 10^−7/5.2 * 10^-22

[[tex]BH^+[/tex]] =  1.5 * 10^15 M

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The coordination number of cobalt in [Co(NH3)5Cl](NO3)2 is 6.

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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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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