Question

【題目】已知：

①CO(g) +H2O(g)=CO2(g)+H2(g) △H = -41.2 kJ mol-1

②CH4(g) +H2O(g)=CO(g) +3H2(g)的能量變化如下圖所示

下列有關(guān)說法正確的是

A. ①和②均為放熱反應(yīng)

B. ①的反應(yīng)物總能量低于生成物總能量

C. CO2(g) +CH4(g)=2CO(g) +2H2(g) △W = -247.4 kJ mol-1

D. CH4(g) +H2O(g)=CO(g) +3H2(g)的活化能大于206.2 kJ mol-1

Answer 1

【答案】D

【解析】根據(jù)圖示CH4(g) +H2O(g)=CO(g) +3H2(g)反應(yīng)吸熱，故A錯誤；①CO(g) +H2O(g)=CO2(g)+H2(g) △H = -41.2 kJ mol-1，反應(yīng)放熱，反應(yīng)物總能量高于生成總能量，故B錯誤；根據(jù)蓋斯定律CO2(g) +CH4(g)=2CO(g) +2H2(g) △W = 247.4 kJ mol-1，故C錯誤；根據(jù)圖示CH4(g) +H2O(g)=CO(g) +3H2(g)的活化能大于206.2 kJ mol-1，故D正確。