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What is the heat of reaction if the heat of combustion of products is 2 J and heat of combustion of reactants is 10 J?

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What is the heat of reaction if the heat of combustion of products is 2 J and heat of combustion of reactants is 10 J?

(a) 8 J

(b) -8 J

(c) 4 J

(d) -4 J

This question was posed to me by my school teacher while I was bunking the class.

My question comes from Heat of Combustion topic 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

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Best answer
The correct answer is (a) 8 J

To explain: Heat of reaction = 10 – 2 = 8 J.

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