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For the formation of carbon monoxide (CO) from the elements at 298 K $(\Delta H - \Delta U)$ is (R=8.314 $JK^{-1}mol^{-1}$)

(a) -2477.57 J/mol
(b) 2477.57 J/mol
(c) -1238.78 J/mol
(d) 1238.78 J/mol

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Answer: 1238.78 J/mol
$C(s) + 1/2 O_2 (g) \longrightarrow CO(g)$
$\Delta n_g = 1-\frac{1}{2} = \frac{1}{2}$
$\Delta H - \Delta U = \Delta n_g RT=\frac{1}{2}\times 8.314 JK^{-1}mol^{-1} \times 298 = 1238.78$ J/mol
answered Feb 28, 2014 by mosymeow_1

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