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What is the heat of reaction for 2CO + O2 -> 2CO2, if the heat of combustion of CO = 20 J, O2 = 5 J, and CO2 = 25 J?

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What is the heat of reaction for 2CO + O2 -> 2CO2, if the heat of combustion of CO = 20 J, O2 = 5 J, and CO2 = 25 J?

(a) 5 J

(b) -5 J

(c) 15 J

(d) -15 J
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Right answer is (c) 15 J

Explanation: Heat of reaction = 20*2 + 5 – 2*25 = -5 J.
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