Question

What is the fraction of a gas in a system at partial pressure 1 mm Hg, if the 0.2 fraction of the same gas is at partial pressure 2 mm Hg and 0.3 fraction at partial pressure 3 mm Hg (Use Freundlich Isotherm)?

(a) 0.1

(b) 0.2

(c) 0.3

(d) 0.4

This question was posed to me during an online interview.

My doubt stems from Liquids and Gases in Equilibrium with Solids topic in section Liquids and Gases in Equilibrium with Solids and Energy: Terminology, Concepts, and Units of Basic Chemical Engineering

Answer 1

Correct choice is (a) 0.1

For explanation: y1/y2 = (p1/p2)^n, => 0.2/0.3 = (2/3)^n => n = 1, => 0.2 = k*2^1 = k = 0.1, => y = 0.1*1^1 = 0.1.