题目

298K时，已知下列物质的标准摩尔燃烧焓：Delta cHmtheta(C_(2)H_(5)OH,l)=-1366.8kJcdot mol^-1，Delta cHmtheta(CH_(3)COOH,l)=-874.5kJcdot mol^-1，Delta cHmtheta(O_(2),g)=0kJcdot mol^-1。则反应C_(2)H_(5)OH(l)+O_(2)(g)=CH_(3)COOH(l)+H_(2)O(l)的Delta rHmtheta为（）A. -492.3kJcdot mol^-1B. -2241.3kJcdot mol^-1C. 2241.3kJcdot mol^-1D. 492.3kJcdot mol^-1

298K时，已知下列物质的标准摩尔燃烧焓：$\Delta cHm\theta(C_{2}H_{5}OH,l)=-1366.8kJ\cdot mol^{-1}$，$\Delta cHm\theta(CH_{3}COOH,l)=-874.5kJ\cdot mol^{-1}$，$\Delta cHm\theta(O_{2},g)=0kJ\cdot mol^{-1}$。则反应$C_{2}H_{5}OH(l)+O_{2}(g)=CH_{3}COOH(l)+H_{2}O(l)$的$\Delta rHm\theta$为（）

A. $-492.3kJ\cdot mol^{-1}$

B. $-2241.3kJ\cdot mol^{-1}$

C. $2241.3kJ\cdot mol^{-1}$

D. $492.3kJ\cdot mol^{-1}$

题目解答

答案

A. $-492.3kJ\cdot mol^{-1}$