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# Molar Mass Table

The weight of one mole of any chemical compounds is known as molar mass. Remember one mole of any substance contains 6.022 $\times$ 10$^{23}$ constituent particles. The chemical compounds whose molar mass range between 18 g/mol of water to hundreds of grams per mole for more complex chemical compounds can be determine in the chemistry laboratory. The lightest possible chemical compound is hydrogen gas, or $H_{2}$ and heaviest can consider as macromolecules. The molecular mass or molecular weight can be defined as the mass of one molecule of a substance. It is expressed in the unified atomic mass units (u) here one u is equal to 1/12th of the mass of one atom of carbon-12.  On the other hand molar mass or molar weight is the mass of one mole of a substance. Molar mass is usually expressed in g/mol. The mole is the standard method for communicating to express the quantity of a substance.

One mole of any elementary entities contains 6.022 $\times$ 10$^{23}$ constituent particles. 6.022 $\times$ 10$^{23}$ is Avogadro's number which is a constant. Hence we can say that one mole of donuts contains 6.022 $\times$ 10$^{23}$ donuts or 1mole of $H_{2}O$ contains 6.022 $\times$ 10$^{23}$ molecules or 1 mole of nails contains 6.022 $\times$ 10$^{23}$ nails or 1mole of Fe contains 6.022 $\times$ 10$^{23}$ atoms etc. So we can say that molar mass is the weight in grams of one mole which contains 6.022 $\times$ 10$^{23}$ entities. Hence a molar mass is the mass in grams of 6.022 $\times$ 10$^{23}$ entities.

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## How to Find Molar Mass?

The molar mass of a substance is the mass of one mole of its. It can say as the grams of substance found in one mole of the substance. The molar mass can be determined with the help of sum of the atomic masses of all constituent atoms. For example; the molar mass of $Al(NO_{3})_{3}$  will be equal to the total of masses of one Al atom, 3 N and 9 O atoms. It can be written as

(1 x 26.98) + (3 x 14.007) + (9 x 16.00) = 213.00 g/mol

Hence we can say that the molar mass of one mole of aluminum nitrate is 213.00 grams or 213.00 grams of aluminum nitrate contains 6.022 $\times$ 10$^{23}$ entities of $Al(NO_{3})_{3}$.

## Molar Mass Table of Elements

The atomic mass of an element helps to determine the molar mass of elements by looking the Periodic table such as the atomic mass of carbon is 12.01 hence it is equal to molar mass in g/mole. It will not applicable on diatomic elements like $O_{2}$, $N_{2}$, $H_{2}$ etc.  Some of the elements with their molar mass are listed below.

 Molar Mass (g/mol) Element Atomic Number 1.0079 H 1 4.0026 He 2 6.941 Li 3 9.0122 Be 4 10.811 B 5 12.0107 C 6 14.0067 N 7 15.9994 O 8 18.9984 F 9 20.1797 Ne 10 22.9897 Na 11 24.305 Mg 12 26.9815 Al 13 28.0855 Si 14 30.9738 P 15 32.065 S 16 35.453 Cl 17 39.0983 K 18 39.948 Ar 19 40.078 Ca 20 44.9559 Sc 21 47.867 Ti 22 50.9415 V 23 51.9961 Cr 24 54.938 Mn 25

## Molar Mass Table of Compounds

Some of the compounds with their molar mass are listed below.

 Chemical Compound Molar Mass (gram/mol) Ammonia () 17 Carbon Dioxide () 44 Dichlorodifluoromethane 121 Ethanol 46.1 Hydrogen 2.02 Nitrogen 28 Oxygen 32 Water 18

We know that a chemical compound is composed of more than more elements therefore the molar mass of a chemical compound will be sums of molar masses of all the constituent atoms of the compound.

## Molar Mass of $NaCl$

Sodium chloride is composed of one sodium atom and one chlorine atom. Therefore the molar masses of chemical compounds would be equal to the sums of the molar masses of all the atoms in one molecule. Hence molar mass of sodium chloride would be equal to the molar mass of one atom of sodium plus the molar mass of one atom of chlorine.

(1 $\times$ 23 grams/mole Na) + (1 $\times$ 35.5 grams/mole Cl) = 58.5 grams/mole.

## Molar Mass of $CaCl_{2}$

In case of compounds with more than one similar atom, we have to multiply the atomic mass of that element with the number given in subscript. For example, the chemical formula of iron (II) chloride is  FeCl2 hence there are one atom of Fe and two atoms of Cl. Therefore the molar mass of compound would be;

(1 atom $\times$ 56 grams/mole Fe) + (2 atoms $\times$ 35.5 grams/mole of chlorine) = 127 grams/mole of $FeCl_{2}$

Similarly the molar mass of $CaCl_{2}$ would be;

(1 atom $\times$ 40.078 grams/mole Ca) + (2 atoms $\times$ 35.5 grams/mole of chlorine) = 111.078 g/mol of $CaCl_{2}$.

## Molar Mass of $KCl$

(1 atom $\times$ 39.09 g/mol K) + (2 atoms $\times$ 35.5 grams/mole of chlorine) = 110.09 g/mol of KCl.