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What is the heat of reaction if the heat of combustion of products is 10 J and heat of combustion of reactants is 5 J?

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What is the heat of reaction if the heat of combustion of products is 10 J and heat of combustion of reactants is 5 J?

(a) -5 J

(b) 5 J

(c) 10 J

(d) Cannot be determined

I got this question in final exam.

I want to ask this question from Heat of Combustion topic in division 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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Right choice is (a) -5 J

The explanation is: Heat of reaction = 5 – 10 = -5 J.

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