Question

已知：Fe₂O₂(s)＋C(s)= CO₂(g)＋2Fe(s) △H=234.1kJ·mol^－1

C(s)＋O₂(g)=CO₂(g) △H=－393.5kJ·mol^－

则2Fe(s)＋O₂(g)=Fe₂O₃(s)的△H是  （   

A．－824.4kJ·mol^－1                                                                              B．－627.6kJ·mol^－1

C．－744.7kJ·mol^－1                                                                              D．－169.4kJ·mol^－1

Answer 1

A 

解析:

（2）=（1）就可得2 Fe(s)+  O2(g) = Fe2O3(s)，则ΔΗ= ΔΗ2-ΔΗ1=-824.4 kJ??mol-1。