Question

What is the value of higher heating value if the value of lower heating value is 10 J and the product has 5 moles of H2O and Enthalpy of vaporization is 4 J/mole at standard conditions?

(a) 10 J

(b) 20 J

(c) 30 J

(d) 40 J

This question was addressed to me by my college director while I was bunking the class.

The origin of the question is Heat of Combustion topic in chapter 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 (c) 30 J

The explanation is: HHV = 10 + 5*4 = 30 J.