Question

An aqueous solution with sulfur 10 g/L at the rate is 100 L/min and an organic compound with no sulfur at the rate 50 L/min were put into an extraction machine and produced an aqueous solution with sulfur 1 g/L, what is the amount of sulfur in the organic compound after extraction?

(a) 2 g/L

(b) 5 g/L

(c) 9 g/L

(d) 15 g/L

This question was posed to me in an interview for internship.

I need to ask this question from Solving Material Balance Problems for Single Units topic in section A General Strategy for Solving Material Balance Problems and Solving Material Balance Problems for Single Units of Basic Chemical Engineering

Answer 1

The correct option is (c) 9 g/L

Explanation: Let the amount of sulfur in the organic compound be x. Sulfur balance equation, 100(10) + 50(0) = 100(1) + 50(x), => x = 9 g/L.