For the irreversible reaction, Ca+ 2C = Ca C2 , ? H298 = 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be__________________?
A. 2,40,000 J
B. 30,000 J
C. 60,000 J
D. 90,000 J
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