题目

已知：C(s)+O2(g) CO(g)；ΔH=-110.5 kJ·mol-1① C(s)+O2(g)CO2(g)；ΔH=-393.51 kJ·mol-1②计算下列反应的反应热ΔH：C(s)+CO2(g) 2CO(g)(　　)A.-283.01 kJ·mol              B.172.51 kJ·mol-1C.283.1 kJ·mol-1           D.504.00 kJ·mol-1 答案：解析：根据盖斯定律：将②式反向则CO2(g) C(s)+ O2(g)；ΔH=393.51 kJ·mol-1①式×2得2C(s)+O2(g) 2CO(g)；ΔH=-110.5×2 kJ·mol-1，二式合并得C(s)+CO2(g) 2CO(g)；ΔH=393.51 kJ·mol-1-221 kJ·mol-1=172.51 kJ·mol-1答案：B

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