For the irreversible reaction, Ca+ 2C = CaC2, ΔH°298 = -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. 30000 J
B. 60000 J
C. 90000 J
D. 240000 J
Answer: Option C
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