Question

The mole percent of CO2 and H2O in a mixture is 40% and 60% respectively, what is the mass percent of CO2?

(a) 24.1

(b) 47.2

(c) 61.9

(d) 78.5

This question was posed to me in an online interview.

My question is from Analyses of Multicomponent Solutions and Mixtures topic in section Moles, Density & Concentration of Basic Chemical Engineering

Answer 1

Correct answer is (c) 61.9

The explanation: Let the moles be 40 and 60, => mass of CO2 = 40*44 = 1760, mass of H2O = 1080, => mass percent of CO2 = 61.9%.