已知反应:H2(g)+ 1/2O2(g)=H2O(g)△H1
1/2N2(g)+O2(g)=NO2(g)△H2 1/2 N2(g)+ 3/2H2(g)=NH3(g)△H3
则反应2NH3(g)+ 7/2O2(g)=2NO2(g)+3H2O(g)的△H为
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
高二化学单选题中等难度题
已知反应:H2(g)+ 1/2O2(g)=H2O(g)△H1
1/2N2(g)+O2(g)=NO2(g)△H2 1/2 N2(g)+ 3/2H2(g)=NH3(g)△H3
则反应2NH3(g)+ 7/2O2(g)=2NO2(g)+3H2O(g)的△H为
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
高二化学单选题中等难度题查看答案及解析
已知反应:H2(g)+ 1/2O2(g)=H2O(g)△H1
1/2N2(g)+O2(g)=NO2(g)△H2 1/2 N2(g)+ 3/2H2(g)=NH3(g)△H3
则反应2NH3(g)+ 7/2O2(g)=2NO2(g)+3H2O(g)的△H为
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
高二化学单选题中等难度题查看答案及解析
已知反应:H2(g)+ 1/2O2(g)=H2O(g)△H1
1/2N2(g)+O2(g)=NO2(g)△H2 1/2 N2(g)+ 3/2H2(g)=NH3(g)△H3
则反应2NH3(g)+ 7/2O2(g)=2NO2(g)+3H2O(g)的△H为
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
高二化学单选题中等难度题查看答案及解析
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
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
高二化学选择题简单题查看答案及解析
已知反应:H2(g)+O2(g)=H2O(g) ΔH1
N2(g)+O2(g)=NO2(g) ΔH2
N2(g)+3/2H2(g)=NH3(g) ΔH3
则反应2NH3(g)+O2(g)=2NO2(g)+3H2O(g)的ΔH为( )
A. 2ΔH1+2ΔH2-2ΔH3 B. ΔH1+ΔH2-ΔH3
C. 3ΔH1+2ΔH2+2ΔH3 D. 3ΔH1+2ΔH2-2ΔH3
高二化学单选题中等难度题查看答案及解析
已知反应:H2(g)+O2(g)=H2O(g) ΔH1
N2(g)+O2(g)=NO2(g) ΔH2
N2(g)+3/2H2(g)=NH3(g) ΔH3
则反应2NH3(g)+O2(g)=2NO2(g)+3H2O(g)的ΔH为( )
A. 2ΔH1+2ΔH2-2ΔH3 B. ΔH1+ΔH2-ΔH3
C. 3ΔH1+2ΔH2+2ΔH3 D. 3ΔH1+2ΔH2-2ΔH3
高二化学单选题中等难度题查看答案及解析
已知:(1)H2(g) +1/2O2(g)=H2O(g) △H=-241.8 kJ/mol
(2)1/2N2 (g) + O2(g)=NO2(g) △H=+33.9 kJ/mol
(3)1/2N2 (g) +3/2 H2(g)=NH3(g) △H=-46.0 kJ/mol
计算NH3(g)燃烧生成NO2(g)和H2O(g)的燃烧热
A.282.8 kJ/mol B.-282.8 kJ/mol C.848.4kJ/mol D.-848.4 kJ/mol
高二化学选择题中等难度题查看答案及解析
已知:(1)H2(g)+1/2O2(g)═H2O(g)△H=-241.8kJ/mol
(2)1/2N2 (g)+O2(g)═NO2(g)△H=+33.9kJ/mol
(3)1/2N2 (g)+3/2H2(g)═NH3(g)△H=-46.0kJ/mol
计算NH3(g)燃烧生成NO2(g)和H2O(g)的燃烧热( )
A. 282.8kJ/mol B. -282.8kJ/mol C. 848.4kJ/mol D. -848.4kJ/mol
高二化学单选题中等难度题查看答案及解析
已知NO和O2转化为NO2的反应机理如下:
①2NO(g)2N2O2(g)(快) △H1<0 平衡常数K1
②N2O2(g) +O2(g)2NO2(g) (慢) △H2<0 平衡常数K2
下列说法正确的是
A. 反应过程中的能量变化可用图a表示
B. 2NO(g) +O2(g)2NO2(g)的△H=-(△H1+△H2)
C. 2NO(g)+O2(g)2NO2(g)的平衡常数K=K1/K2
D. 反应②的速率大小决定2NO(g)+O2(g)2NO2(g)的反应速率
高二化学单选题中等难度题查看答案及解析
(1)已知:2N2O5(g )=2N2O4( g )+O2( g ) ∆H1=-4.4kJ·mol-1
2NO2( g)=N2O4(g ) ∆H2 =-55.3kJ·mol-1
则反应N2O5( g )=2NO2(g )+O2(g )的∆H=_______ kJ·mol-1
(2)2molCH3OH(l)在O2(g)中完全燃烧,生成CO2(g)和H2O(l),放出887kJ热量:请写出CH3OH燃烧热的热化学方程式__________________________________
高二化学综合题简单题查看答案及解析