Question

calculate the molar mass of the following substance
(a) ethyne c2h2
(b) sulphur molecules s8
(c) phosphorus molecule p4
(d) hydrochloric acid hc1
(e) nitric acid HNO 3
with explanation
​

Answer 1

Answer:

(a) Ethyne, C2H2

Molar mass of ethyne, C2H2 = 2 x 12 + 2 x 1 = 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

Explanation: