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What is the heat of reaction for H2 + Cl2 -> 2HCl, if the heat of combustion of H2 = 2 J, Cl2 = 10 J, and HCl = 10 J?

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What is the heat of reaction for H2 + Cl2 -> 2HCl, if the heat of combustion of H2 = 2 J, Cl2 = 10 J, and HCl = 10 J?

(a) -8 J

(b) 8 J

(c) -10 J

(d) 10 J

I have been asked this question in an online interview.

My query is from Heat of Combustion topic in division 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 choice is (a) -8 J

The best I can explain: Heat of reaction = 10 + 2 – 2*10 = -8 J.

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