Question

What is the weight fraction of N2 in a gas when it is liquefied? The gas contains 400 ppm of N2 in CO2.

(a) 2.54×10-4

(b) 3.54×10-4

(c) 4.54×10-4

(d) 5.54×10-4

This question was posed to me in final exam.

My question is based upon Concentration-I topic in portion Introductory Concepts of Chemical Process Calculation

Answer 1

The correct answer is (a) 2.54×10-4

To explain: Basis: 106 mole gas.