Question

What is the molecular mass of chlorine?

(a) 71.0 kg/kmole

(b) 35.5 g/kmole

(c) 71.0 g/kmole

(d) 35.5 kg/mole

The question was asked at a job interview.

This interesting question is from P-Block Elements topic in section P-Block Elements of Chemistry – Class 12

Answer 1

Correct choice is (a) 71.0 kg/kmole

Easy explanation: In the periodic table, the atomic mass of chlorine atom is 35.5 AMU. Since chlorine exists in diatomic form, the molecular mass = 35.5g/mole x 2 = 71.0 g/mole. On multiplying and dividing by 1000, 71.0 kg/kmole.