Question

The rate of flow in stream with 20% O2 and 80% CO2 is 5 mole/hr, the contained was initially filled with 3 mole of O2, what will be the percentage of O2 in product stream?

(a) 12.5

(b) 25

(c) 37.5

(d) 50

I had been asked this question by my college director while I was bunking the class.

This is a very interesting question from Multiple Component Systems topic in section Introduction to Material Balances of Basic Chemical Engineering

Answer 1

Right choice is (d) 50

The explanation is: Percentage of O2 = 4/(4 + 4)*100 = 50%.