【例题1】已知:C(s)+H2O(g)=CO(g)+H2(g) △H=a kJ/mol
2C(s)+O2(g)=2CO(g) △H=-220 kJ/mol
H-H、O=O和O-H键的键能分别为436、496和462 kJ/mol,则a为
A.-332 B.-118 C.+350 D.+130
【例题2】在25℃、1.01×105Pa下,将22gCO2通入到750mL1.0mol/L的NaOH溶液中充分反应,放出xkJ热量。已知该条件下,1mol CO2通入到2L1.0mol/LNaOH溶液中充分反应,放出y kJ的热量.则CO2与NaOH溶液反应生成NaHCO3的热化学方程式正确为
A.CO2(g)+NaOH(aq)=NaHCO3(aq)△H=-(2y-x)kJ/mol
B.CO2(g)+NaOH(aq)=NaHCO3(aq)△H=-(4x-y)kJ/mol
C.CO2(g)+NaOH(aq)=NaHCO3(aq)△H=-(2x-y)kJ/mol
D.CO2(g)+NaOH(aq)=2NaHCO3(aq)△H=-(8x-2y)kJ/mol