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What is the heat of reaction for 2CO + O2 -> 2CO2, if the heat of combustion of CO = 20 J, O2 = 5 J, and CO2 = 25 J?

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What is the heat of reaction for 2CO + O2 -> 2CO2, if the heat of combustion of CO = 20 J, O2 = 5 J, and CO2 = 25 J?

(a) 5 J

(b) -5 J

(c) 15 J

(d) -15 J

The question was asked in an online quiz.

The question is 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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Right answer is (c) 15 J

Explanation: Heat of reaction = 20*2 + 5 – 2*25 = -5 J.

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