N2gO2g2的精选

问题详情：已知：2CO(g)+O2(g)==2CO2(g) ΔH=-566kJ·mol-1 N2(g)+O2(g)==2NO(g) ΔH=+180kJ·mol-1则2CO(g)+2NO(g)==N2(g)+2CO2(g)的ΔH是(    ) A．-386kJ·mol-1       B．+386kJ·mol-1 C．-746kJ·mol-1...