试题与答案

298K、10lkPa时,1molH2(g)与O2(g)完全反应生成H2O(g)

题型:选择题

题目:

298K、10lkPa时,1molH2(g)与O2(g)完全反应生成H2O(g)时放出242kJ热量,而生成H2O(1)时放出286kJ热量,则下列表达不正确的是(  )

A.2H2(g)+O2(g)=2H2O(g);△H=-484kJ•mol-1

B.H2O(g)=H2(g)+O2(g);△H=242kJ•mol-1

C.H2(g)+O2(g)=H2O(1);△H=-286kJ•mol-1

D.H2O(1)=H2O(g);△H=-44kJ•mol-1

答案:

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参考答案:D

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