O2gC的精选

问题详情：根据下图所示的各物质能量变化关系，判断下列热化学方程式正确的是()A．C(s，金刚石)＋O2(g)===CO2(g)ΔH1＝akJ·mol－1(a<0)B．C(s，石墨)＋O2(g)===CO2(g)ΔH2＝bkJ·mol－1(b>0)C．C＋O2===CO2ΔH3＝ckJ·mol－1(c>0)D．C(s，金刚石)===C(s，...