单项选择题

A.CO(g)+1/2O2(g)=CO2(g)ΔrHmθ=-238.0kJ.mol-1
B.C(金刚石)+O2(g)=CO2(g)ΔrHmθ=-395.4kJ.mol-1
C.2C(金刚石)+2O2(g)=2CO2(g)ΔrHmθ=-787.0kJ.mol-1
D.C(石墨)+O2(g)=CO2(g)ΔrHmθ=-393.5kJ.mol-1