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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 15 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 15 J?

(a) -5 J

(b) 5 J

(c) 10 J

(d) Cannot say

I got this question in an online quiz.

The above asked question is from Heat of Combustion 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
Correct option is (b) 5 J

The best I can explain: Heat of reaction = 15 – 10 = 5 J.

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