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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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Answer» Right answer is (c) 15 J Explanation: Heat of reaction = 20*2 + 5 – 2*25 = -5 J. |
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