Finds the mass of 125 grams of sodium chloride

58.44g/mol

Required:

Mass of sodium chloride (NaCl)

From the periodic table, it is known that the mass of;

Sodium (Na) = 22.99g/mol

Chlorine (Cl) = 35.45g/mol

From NaCl, there are:

1 atom of sodium and;

1 atom of chlorine.

Therefore, to get the molar mass, or simply mass, of sodium chloride (NaCl), (i) multiply the mass of sodium (22.99g/mol) with the number of atoms (1) in the NaCl. i.e

22.99g/mol x 1  = 22.99g/mol

(ii) multiply the mass of chlorin (35.45g/mol) with the number of atoms (1) in the NaCl. i.e

35.45g/mol x 1  = 35.45g/mol

(iii) add the results in (i) and (ii) together. i.e

22.99 + 35.45 = 58.44g/mol

In essence, the molar mass of Sodium chloride is the sum of the molar masses of the atoms of sodium and chlorine. This is 58.44g/mol

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