Question

已知：2CO(g) + O 2 (g) = 2CO 2 (g)　Δ H ="-566" kJ·mol -1 N 2 (g) + O 2 (g) =2NO(g)　Δ H ="+180

已知：2CO(g) + O 2 (g) = 2CO 2 (g)　Δ H ="-566" kJ·mol -1 N 2 (g) + O 2 (g) =2NO(g)　Δ H ="+180" kJ·mol -1 则2CO(g) +2NO(g) = N 2 (g)+2CO 2 (g)的Δ H 是 A．-386kJ·mol -1 B．+386kJ·mol -1 C．- D．+746kJ·mol -1

Answer 1

C

考查盖斯定律的应用，根据已知反应可知，①－②即得到2CO(g) +2NO(g) = N 2 (g)+2CO 2 (g)，所以反应热Δ H ＝―566 kJ·mol -1 ―180 kJ·mol -1 ＝－746kJ·mol -1 ，答案选C。【题型】选择题