$(ΔH - ΔU)$ for the formation of carbon monoxide (CO) from its elements at 298 K is : $(R = 8.314 {JK}^{- 1} {mol}^{- 1})$ .

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$1238.78 J {mol}^{- 1}$

$- 1238.78 J {mol}^{- 1}$

$2477.57 J {mol}^{- 1}$

$- 2477.57 J {mol}^{- 1}$

answer is A.

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Detailed Solution

The reaction of carbon and oxygen takes place as,

$\begin{array}{l} C (g) + \frac{1}{2} O_{2} (g) ⟶ CO (g) \\ Δ n_{g} = + \frac{1}{2} \\ Δ H - Δ U = Δ n_{g} R \cdot T = \frac{1}{2} \times 8.314 \times 298 \end{array}$

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