已知在298K时的有关数据:C(s)+1/2O2(g)===CO(g);ΔH1=-110.5kJ·mol-1;C(s)+O2(g)===CO2(g);ΔH2=-393.5kJ·mol-1。则C(s)+CO2(g)===2CO(g)的ΔH为( )A.+283.5kJ·mol-1B.+172.5kJ·mol-1C.-172.5kJ·mol-1D.-504kJ·mol-1
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B解析试题分析:根据盖斯定律可知,①×2-②即得到C(s)+CO2(g)===2CO(g),所以该反应的ΔH=-110.5kJ/mol×2+393.5kJ/mol=+172.5kJ·mol,