Question

Enthalpy of reactants is 50 J/Kg and enthalpy of products is 25 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 an interview.

I'm obligated to ask this question of Standard Heat (Enthalpy) of Formation 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 option is (c) -25 J/Kg

Best explanation: Heat of reaction = 25 – 50 = -25 J/Kg.