Question

A reactor is supplied with 5 moles of KNO3 and some H2SO4, if the extent of reaction is 2, how many moles of H2SO4 were supplied?

(a) 1

(b) 2

(c) 5

(d) Cannot be determined

This question was addressed to me during an interview for a job.

Origin of the question is Species Material Balances topic in division The Chemical Reaction Equation & Stoichometry, Material Balances for Processes Involving Reaction and Multiple Units of Basic Chemical Engineering

Answer 1

The correct option is (d) Cannot be determined

To explain: Since the final moles of H2SO4 are not given, initial moles cannot be determined.