/resources/vue_pro/ueditor/themes/default/images/spacer.gif、/resources/vue_pro/ueditor/themes/default/images/spacer.gif、/resources/vue_pro/ueditor/themes/default/images/spacer.gif、/resources/vue_pro/ueditor/themes/default/images/spacer.gif、/resources/vue_pro/ueditor/themes/default/images/spacer.gif、3．已知下列两个反应热△rHm(1)和△rHm(2)（1）C(s)+O2(g)=CO2(g);△rHm(1)=－393.5kJ/mol（2）CO(g)+1/2O2(g)=CO2(g);△rHm(2)=－283.0kJ/mol求反应C(s)+1/2O2(g)=CO(g)的△rHm是（）kJ/mol。A．－110.5B．110.5C．221D．－221