Calculate the molar mass of: (a) Ethyne (b) Sulphur molecule

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

(a) Chemical formula of Ethyne C2H2

Molar mass of ethyne = 2 x 12 + 2 x 1

Molar mass of ethyne = 26 g

(b) Chemical formula of Sulphur molecule S8

Molar mass of sulphur molecule = 8 x 32 = 256 g

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

Molar mass of phosphorus molecule = 4 x 31 = 124 g

(d) Chemical formula of Hydrochloric acid HCl

Molar mass of hydrochloric acid = 1 + 35.5 = 36.5 g

(e) Chemical formula of Nitric acid HNO3

Molar mass of nitric acid = 1 + 14 + 3 x 16 = 63 g