For the irreversible reaction, Ca + C = CaC2, ΔH°298 = - 60,000 J.mol-1. If a system, initially containing 2 moles of calcium, 3 moles of carbon and one mole of calcium carbide, is allowed to react to completion, the heat evolved, at 298 K will be . . . . . . . . J.
A. 30,000
B. 60,000
C. 90,000
D. 240,000
Answer: Option C
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