已知C(s)+O2(g)→CO(g)的△rH=-110.5kJ·mol-1，C(s)+O2(g)→CO2(g)的△rH=-393.5kJ·mol-1，则CO(s)+O2(g)→CO2(g)的△rH=（）A: -283.0kJ·mol-1 B: 283.0kJ·mol-1 C:-110.5kJ·mol-1 D:-504.0kJ·mol-1 答案: -283.0kJ·mol-1

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已知C(s)+O2(g)→CO(g)的△rH=-110.5kJ·mol-1，C(s)+O2(g)→CO2(g)的△rH=-393.5kJ·mol-1，则CO(s)+O2(g)→CO2(g)的△rH=（ ）A: -283.0kJ·mol-1 B: 283.0kJ·mol-1 C:-110.5kJ·mol-1 D:-504.0kJ·mol-1 答案: -283.0kJ·mol-1