Question

A mixture contains 10% CO, 40% CO2 and 50% H2O, what is the mass percent of CO2?

(a) 9.5

(b) 15.4

(c) 39.5

(d) 74.1

I have been asked this question in an international level competition.

My question is based upon Analyses of Multicomponent Solutions and Mixtures topic in chapter Moles, Density & Concentration of Basic Chemical Engineering

Answer 1

Correct answer is (a) 9.5

Best explanation: Mass percent of CO2 = 10*28/[10*28 + 40*44 + 50*18] = 9.5%.