Question

What is the number of moles of H2 after the reaction?

(a) 10

(b) 15

(c) 20

(d) None of the mentioned

This question was addressed to me in an international level competition.

My question is based upon Species Mole Balances-II topic in division Material Balances without Reaction and Material Balances Involving Reactions of Chemical Process Calculation

Answer 1

Correct answer is (a) 10

For explanation: Moles of H2 = Initial moles of H2 – 3(Extent of the reaction).