MCQ
$(\Delta H - \Delta U)$ for the formation of carbon monoxide $(CO)$ from its elements at $298\, K$ is ............. $\mathrm{J\,mol}^{-1}$ $(R= 8.314\,J\,K^{-1}\, mol^{-1})$
- A$- 2477.57$
- B$2477.57$
- C$-1238.78$
- ✓$1238.78$
✓
Answer
Correct option: D.
$1238.78$
d
For the reaction, $C_{(s)}+\frac{1}{2} O_{2(g)} \rightarrow C O$
For the reaction, $C_{(s)}+\frac{1}{2} O_{2(g)} \rightarrow C O$
$\Delta H=\Delta U+\Delta n R T$
or $\quad \Delta H-\Delta U=\Delta n R T$
$\Delta n=1-\frac{1}{2}=\frac{1}{2}$
$\Delta H-\Delta U=\frac{1}{2} \times 8.314 \times 298$
$=1238.78 \,J \,m o l^{-1}$
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