下列说法正确的是
A.由H原子形成1 mol H—H键要吸收热量 |
B.C(石墨,s) ="=" C(金刚石,s) ΔH=+1.9kJ/mol,则可判定金刚石比石墨稳定 |
C.500℃、30 MPa下,0.5 mol N2(g)和1.5 mol H2(g)反应生成NH3(g)放热19.3 kJ,其热化学方程式为N2(g)+3H2(g) 2NH3(g) ΔH=-38.6 kJ/mol |
D.已知Ni(CO)4(s)=Ni(s)+4CO(g) ΔH=Q kJ/mol,则Ni(s)+4CO(g)=Ni(CO)4(s) ΔH=-Q kJ/mol |