Question

A mixture contains 20% NaCl, 30% CH4 and 50% H2O, what is the mass percent of NaCl?

(a) 21

(b) 34

(c) 45

(d) 68

The question was posed to me by my college director while I was bunking the class.

My doubt is from Analyses of Multicomponent Solutions and Mixtures in chapter Moles, Density & Concentration of Basic Chemical Engineering

Answer 1

Right answer is (b) 34

Best explanation: Mass percent of NaCl = 20*35.5/[20*35.5 + 30*16 + 50*18] = 34%.