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What is the heat of reaction for CH4 + 2O2 -> CO2 + 2H2O, if the heat of combustion of H2O = 5 J, CO2 = 10 J, O2 = 0, and CH4 = 25 J?

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What is the heat of reaction for CH4 + 2O2 -> CO2 + 2H2O, if the heat of combustion of H2O = 5 J, CO2 = 10 J, O2 = 0, and CH4 = 25 J?

(a) -5 J

(b) 5 J

(c) -10 J

(d) 10 J

This question was addressed to me during an interview.

I would like to ask this question from Heat of Combustion topic in chapter 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 (b) 5 J

Easiest explanation: Heat of reaction = 25 + 0 – 10 – 2*5 = 5 J.

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