Question

50 Kg of a solid liquid mixture containing 10% solid and 90% water is left open in an atmosphere, after some time the water is 80%, what is the weight of the mixture now?

(a) 10 Kg

(b) 25 Kg

(c) 35 Kg

(d) 50 Kg

The question was asked in an interview.

Query is from Solving Material Balance Problems for Single Units 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 answer is (b) 25 Kg

To explain I would say: Let the new weight of mixture be P. Solid balance: 0.1(50) = 0.2P, => P = 25 Kg.