Question

A process is carried out for the feed mixture of 95% air and 5% ammonia vapor, the compressor recovered 40% of ammonia, what is the exit pressure of the compressor, if the partial pressure of ammonia vapor is 10 mm Hg?

(a) 225.4 mm Hg

(b) 326.8 mm Hg

(c) 451.2 mm Hg

(d) 593.5 mm Hg

The question was posed to me by my school teacher while I was bunking the class.

I want to ask this question from Condensation in chapter Real Gases: Equations of State, Single Component Two Phase Systems, Saturation & Condensation of Basic Chemical Engineering

Answer 1

Right choice is (b) 326.8 mm Hg

Easiest explanation: Exit components, ammonia: 0.05*0.6 = 0.03, air: 0.95, => yammonia = 0.03/0.98 = 0.0306, => Total exit pressure = 10/0.0306 = 326.8 mm Hg.