Question

已知①2C(s)+O2(g)2CO(g)　ΔH=-221.0 kJ·mol-1

②2H2(g)+O2(g)2H2O(g)　ΔH=-483.6 kJ·mol-1

则反应C(s)+H2O(g)CO(g)+H2(g)的ΔH为(　　)

A.+131.3 kJ·mol-1B.-131.3 kJ·mol-1 C.-352.3 kJ·mol-1D.+262.6 kJ·mol-1

 

Answer 1

A

【解析】把方程式(①-②)/2,得出C(s)+H2O(g)CO(g)+H2(g)　ΔH=(-221.0 kJ·mol-1+483.6 kJ·mol-1)/2=+131.3 kJ·mol-1,所以选A。