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What is the heat of reaction for N2 + 3H2 -> 2NH3, if the heat of combustion of N2 = 5 J, H2 = 2 J, and NH3 = 15 J?

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What is the heat of reaction for N2 + 3H2 -> 2NH3, if the heat of combustion of N2 = 5 J, H2 = 2 J, and NH3 = 15 J?

(a) -5 J

(b) 5 J

(c) -19 J

(d) 19 J

I got this question in an online interview.

The doubt 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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The correct answer is (c) -19 J

To explain I would say: Heat of reaction = 3*2 + 5 – 15*2 = -19 J.

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