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What is the heating value of 2 Kg of coal with heat of combustion 15 J/Kg?

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What is the heating value of 2 Kg of coal with heat of combustion 15 J/Kg?

(a) -15 J

(b) 15 J

(c) -30 J

(d) 30 J

I have been asked this question at a job interview.

This is a very interesting question 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
Right option is (c) -30 J

Easy explanation: Heating value = – Heat of combustion = -15*2 = -30 J.

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