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Heat of formations of A, B, C, and D, are 3 J, 5 J, 4 J, and 8 J respectively, what is the heat of reaction 2A + 2B -> 2C + D?

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Heat of formations of A, B, C, and D, are 3 J, 5 J, 4 J, and 8 J respectively, what is the heat of reaction 2A + 2B -> 2C + D?

(a) -5 J

(b) 0

(c) 5 J

(d) 8 J

I have been asked this question during an internship interview.

My doubt stems from Standard Heat (Enthalpy) of Formation 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

1 Answer

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Best answer
Right option is (b) 0

The explanation: Heat of reaction = 8 + 2*4 – 2*5 – 2*3 = 0.

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