Question

Which of the following represents constant volume system?

(a) C + O2 → CO2

(b) CO + H2O → CO2 + H2

(c) N2 + 3H2 → 2NH3

(d) SO2 + 0.5O2 → SO3

This question was addressed to me during an online exam.

This interesting question is from Stoichiometry topic in division Rate Laws and Stoichiometry of Chemical Reaction Engineering

Answer 1

Right answer is (b) CO + H2O → CO2 + H2

Explanation: Gas phase reactions in which the number of moles of the product is equal to the number of moles of reactant is a constant volume system. In CO + H2O → CO2 + H2, 2 moles of reactants form 2 moles of product.