已知反应:H2(g)+O2(g)=H2O(g)△H1N2(g)+O2(g)=NO2(g)△H2N2(g)+H2(g)=NH3(g)△H3则反应2NH3(g)+O2(g)=2NO2(g)+3H2O(g)

题目简介

已知反应:H2(g)+O2(g)=H2O(g)△H1N2(g)+O2(g)=NO2(g)△H2N2(g)+H2(g)=NH3(g)△H3则反应2NH3(g)+O2(g)=2NO2(g)+3H2O(g)

题目详情

已知反应:H2(g) + O2(g) = H2O(g)     △H1
N2(g) + O2(g) = NO2 (g)      △H2
N2(g) + H2(g) = NH3 (g)     △H3
则反应2NH3 (g) +O2(g) =2NO2 (g) +3H2O(g) 的△H=
A.2△H1+2△H2—2△H3B.△H1+△H2—△H3
C.3△H1+2△H2+2△H3D.3△H1+2△H2—2△H3
题型:单选题难度:中档来源:不详

答案

D

试题分析:方程式①×3+②×2-③×2得到反应2NH3 (g) +O2(g) =2NO2 (g) +3H2O(g) ,所以该反应的△H=3△H1+2△H2—2△H3。

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