Question

Enthalpy of reactants is 15 J/Kg and enthalpy of products is 40 J/Kg, what is the heat of reaction?

(a) -10 J/Kg

(b) 10 J/Kg

(c) -25 J/Kg

(d) 25 J/Kg

The question was posed to me in examination.

This interesting question is from Standard Heat (Enthalpy) of Formation in portion 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

The correct option is (d) 25 J/Kg

To explain: Heat of reaction = 40 – 15 = 25 J/Kg.