Question

An unsteady state system, the flow in rate of A is 5 mole/s, what is the flow out rate of B if the accumulation was 10 mole in 5 seconds?

(a) 1 mole/s

(b) 2 mole/s

(c) 3 mole/s

(d) 5 mole/s

This question was posed to me in a job interview.

I want to ask this question from Steady-State and Unsteady-State Systems topic in section Introduction to Material Balances of Basic Chemical Engineering

Answer 1

The correct choice is (c) 3 mole/s

The explanation: Flow rate of B = 5 – 10/5 = 3 mole/s.