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What is the heat of reaction if the heat of combustion of products is 25 J and heat of combustion of reactants is 15 J?

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What is the heat of reaction if the heat of combustion of products is 25 J and heat of combustion of reactants is 15 J?

(a) -5 J

(b) 5 J

(c) -10 J

(d) 10 J

The question was posed to me during an internship interview.

This intriguing question originated from Heat of Combustion 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

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Best answer
The correct choice is (c) -10 J

Easiest explanation: Heat of reaction = 15 – 25 = -10 J.

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