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What is the heat of reaction for C6H6 + 3H2 -> C6H12, if the heat of combustion of H2 = 2 J, C6H6= 30 J, and C6H12 = 25 J?

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What is the heat of reaction for C6H6 + 3H2 -> C6H12, if the heat of combustion of H2 = 2 J, C6H6= 30 J, and C6H12 = 25 J?

(a) -6 J

(b) 6 J

(c) -11 J

(d) 11 J
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Correct choice is (d) 11 J

The best I can explain: Heat of reaction = 30 + 2*3 – 25 = 11 J.
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