Calculate the molar mass of the following substances. (a) Ethyne, C2H2 (b) Sulphur molecule, S8 (c) Phosphorus molecule, P4 (Atomic mass of phosphorus = 31) (d) Hydrochloric acid, HCl (e) Nitric acid, HNO3
The molar mass of the following: [Unit is ‘g’] (a) Ethyne, C2H2 = 2 × 12 + 2 × 1 = 24 + 2 = 26 g (b) Sulphur molecule, S8 = 8 × 32 = 256 g (c) Phosphorus molecule, P4 = 4 × 31 = 124 g (d) Hydrochloric acid, HCl = 1 × 1 + 1 × 35.5 = 1 + 35.5 = 36.5 g (e) Nitric acid, HNO3 = 1 × 1 + 1 × 14 + 3 × 16 = 1 + 14 + 48 = 63 g
