Question

What is the enthalpy of reaction for CO2 + 4H2 -> 2H2O + CH4, if the conversion of CO2 is 50%, and heat of formation of CO2, H2, H2O, and CH4 are 6 J, 0, 4 J and 10 J?

(a) 2 J

(b) 5 J

(c) 6 J

(d) 9 J

The question was posed to me in quiz.

This interesting question is from Heat (Enthalpy) of Reaction topic in section Application of Energy Balances in the Absence of Chemical Reactions and Energy Balances: How to Account for Chemical Reaction of Basic Chemical Engineering

Answer 1

Right answer is (d) 9 J

To elaborate: Heat of reaction = 10*0.5 + 2*4*0.5 + 6*0.5 – 6*0.5 = 9 J.