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(ΔH− ΔU) for the formation of carbon monoxide (CO) from its elements at 298 K is
(R = 8.314 J K^–1 mol^–1)

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–1238.78 J mol^–1

2477.57 J mol^–1

–2477.57 J mol^–1

1238.78 J mol^–1

answer is A.

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Detailed Solution

ΔH− ΔU = Δn_gRT
$= - \frac{1}{2} \times 8.314 \times 298$
= –1238.78

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