题目内容
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为
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则反应2NH3(g)+
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A.2△H1+2△H2-2△H3 | B.△H1+△H2-△H3 |
C.3△H1+2△H2+2△H3 | D.3△H1+2△H2-2△H3 |
D
考查盖斯定律的应用。根据已知反应①H2(g)+
O2(g)=H2O(g)、②
N2(g)+O2(g)=NO2(g)、③
N2(g)+
H2(g)=NH3(g)可知,将①×3+2×②-2×③即得到2NH3(g)+
O2(g)=2NO2(g)+3H2O(g),所以该反应的反应热为△H=3△H1+2△H2-2△H3。所以正确的答案是D。
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