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In the reaction C + 2H2 -> CH4, if the heat liberated is -5 J, what is the heat of formation of CH4?

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In the reaction C + 2H2 -> CH4, if the heat liberated is -5 J, what is the heat of formation of CH4?

(a) -5J

(b) 5 J

(c) 0 J

(d) Cannot be determined

I had been asked this question in an internship interview.

My question is based upon Standard Heat (Enthalpy) of Formation 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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Right answer is (b) 5 J

The explanation is: Heat of formation = – (-5) = 5 J.

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