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