Question

What is the mole fraction of Ar?

(a) 0.2

(b) 0.4

(c) 0.6

(d) 0.8

I had been asked this question during a job interview.

I'm obligated to ask this question of Mole and Molecular Weight topic in section Introductory Concepts of Chemical Process Calculation

Answer 1

Correct choice is (a) 0.2

Easiest explanation: Mole fraction = Moles of the component / Total moles.