已知:
①C(s)+1/2O2(g)══CO(g) ΔH1=-110.35kJ·mol-1
②CO(g)+1/2O2(g)══CO2(g) ΔH2=-282.57kJ·mol-1
③C(s)+O2(g)══CO2(g) ΔH3 则ΔH3等于A.+172.22 kJ·mol-1B.-172.22 kJ·mol-1C.+392.92 kJ·mol-1D.-392.92 kJ·mol-1
网友回答
D解析由于反应热具有加和性,根据盖斯定律①+②即可以得③,同样ΔH3=ΔH1+ΔH2,故ΔH3=-392.92kJ·mol-1。