2. 試求 798K 時下列反應的 \(\Delta H^\circ\) \(\Delta H^\circ=-68407.5\text{cal}\)\[ \text{CO} + \frac{1}{2}\text{O}_2 \rightarrow \text{CO}_2 \]每莫耳的物性如下: \(\Delta H^\circ_{298} = -67640\text{cal}\)                               \(C_{p,\text{CO}} = 6.97\text{cal}, C_{p,\text{O}_2} = 7.05\text{cal}, C_{p,\text{CO}_2} = 8.96\text{cal}\)