Question

已知下列熱化學方程式：

① Fe₂O₃(s)+ 3CO(g) = 2Fe(s) + 3CO₂(g)      △H= -25kJ·mol^-1

② 3Fe₂O₃(s)+ CO(g) = 2Fe₃O₄(s) + CO₂(g)   △H= - 47kJ·mol^-1

則下列關于Fe₃O₄(s)被CO還原成Fe(s)和CO₂的熱化學方程式的書寫中正確的是(  )

A．Fe₃O₄+ 4CO = 3Fe + 4CO₂                   △H= -14kJ·mol^-1

B．Fe₃O₄(s)+ 4CO(g) = 3Fe(s) + 4CO₂(g)    △H= -22kJ·mol^-1

C．Fe₃O₄(s)+ 4CO(g) = 3Fe(s) + 4CO₂(g)    △H= +14kJ·mol^-1

D．Fe₃O₄(s)+ 4CO(g) = 3Fe(s) + 4CO₂(g)    △H= -14kJ·mol^-1

 

Answer 1

D

解析:由蓋斯定律，①×3/2  -②/2即可；故△H=-14kJ·mol^-1