Calculate the molar mass of: (a) Ethyne (b) Sulphur molecule (c) Phosphorus molecule (d) Hydrochloric acid (e) Nitric acid


Molar mass is defined as the mass of substance for a given amount. The amount of molecules or atoms or compounds present in one mole of substance is given by this. Molar mass SI unit is g/mol.

The molar mass of the following substances are as follows:

(a) Ethyne, C2H2

Molar mass of ethyne

C2H2 = 2 x 12 + 2 x 1

Molar mass of ethyne = 26 g

(b) Sulphur molecule, S8

Molar mass of sulphur molecule,

S8 = 8 x 32 = 256 g

(c) Phosphorus molecule, P4 (atomic mass of phosphorus = 31)

Molar mass of phosphorus molecule,

P4 = 4 x 31 = 124 g

(d) Hydrochloric acid, HCl

Molar mass of hydrochloric acid,

HCl = 1 + 35.5 = 36.5 g

(e) Nitric acid, HNO3

Molar mass of nitric acid,

HNO3 = 1 + 14 + 3 x 16 = 63 g

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1 Comment

  1. pushpita prajapati

    Wow this clear my consapt this gives more easir to learn

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