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What is the heat of reaction for C6H6 + 3H2 -> C6H12, if the heat of combustion of H2 = 2 J, C6H6= 30 J, and C6H12 = 25 J?

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What is the heat of reaction for C6H6 + 3H2 -> C6H12, if the heat of combustion of H2 = 2 J, C6H6= 30 J, and C6H12 = 25 J?

(a) -6 J

(b) 6 J

(c) -11 J

(d) 11 J

This question was addressed to me in semester exam.

My question is based upon 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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Correct choice is (d) 11 J

The best I can explain: Heat of reaction = 30 + 2*3 – 25 = 11 J.

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