Question

A container has 10 grams of water 5 grams of water is added and 2 grams of water is taken out, what is the final amount of water?

(a) 7 grams

(b) 10 grams

(c) 13 grams

(d) 15 grams

This question was posed to me by my school principal while I was bunking the class.

My doubt is from Material Balance Concept in portion Introduction to Material Balances of Basic Chemical Engineering

Answer 1

Right answer is (c) 13 grams

The explanation: Final condition = Initial condition + sum of inputs – sum of outputs = 10 + 5 – 2 = 13 grams.