- 问题详情:已知下列热化学方程式:Zn(s)+1/2O2(g)=ZnO(s)ΔH=-351.1kJ·mol-1①Hg(l)+1/2O2(g)=HgO(s)ΔH=-90.7kJ·mol-1②由此可知Zn(s)+HgO(s)=ZnO(s)+Hg(l)的反应热ΔH为A.-260.4kJ·mol-1 B.+260.4kJ·mol-1 C.-441.8kJ·mol-1 D.+441.8kJ·mol-1【回答】A【解析】【详解】考查盖斯定...
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- 问题详情:今有如下三个热化学方程式: H2(g)+1/2O2(g)=H2O(g);ΔH=aKJ·mol-1,H2(g)+1/2O2(g)=H2O(l);ΔH== bkJ·mol-1,2H2(g)+O2(g)=2H2O(l);ΔH== ckJ·mol-1,关于它们的下列表述正确的是( )A.它们都是吸热反应 B.a、b和c均为正值 C.2b== c ...
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- 问题详情:以下几个热化学方程式,能表示有关物质燃烧时的燃烧热的热化学方程式是A.C(s)+1/2O2(g)═CO(g)△H=+110.5kJ?mol﹣1B.C(s)+O2(g)═CO2(g)△H=﹣393.5kJ?mol﹣1C.2H2(g)+O2(g)═2H2O(l)△H=﹣571.6kJ?mol﹣1D.H2(g)+1/2O2(g)═H2O(g)△H=﹣241.8kJ?mol﹣1【回答】【*】B【解析】【分析】燃烧热是指1mol纯净...
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- 问题详情:在2000K时,反应CO(g)+1/2O2(g) CO2(g)的平衡常数为K1,则相同温度下反应2CO2(g) 2CO(g)+O2(g)的平衡常数K2为A.1/K12 B.K12 C.1/K1 D.K1-1/2【回答】A知识点:化学平衡单元测试题型:选择题...
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- 问题详情:已知:(1)H2(g)+1/2O2(g)====H2O(g) ΔH1=akJ·mol-1(2)2H2(g)+O2(g)====2H2O(g) ΔH2=bkJ·mol-1(3)H2(g)+1/2O2(g)====H2O(l) ΔH3=ckJ·mol-1(4)2H2(g)+O2(g)====2H2O(l) ΔH4=dkJ·mol-1下列关系式正确的是A.a<c<0 B.b>d>0 C.2a=b<0 D.2c=d>0...
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- 问题详情:已知下列热化学方程式:①H2(g)+1/2O2(g)=H2O(l)ΔH=-285kJ·mol-1②H2(g)+1/2O2(g)=H2O(g)ΔH=-241.8kJ·mol-1 ③C(s)+1/2O2(g)=CO(g)ΔH=-110.5kJ·mol-1④C(s)+O2(g)=CO2(g)ΔH=-393.5kJ·mol-1回答下列问题:(1)H2的燃烧热为____________;C的燃烧热为______________。(2)燃烧1gH2生成液...
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- 问题详情:已知下列热化学方程式:Zn(S)+1/2O2(g)=ZnO(S)△H1;Hg(l)+1/2 O2(g)=HgO(S)△H2;则Zn(S)+HgO(S)=Hg(l)+ZnO(S)△H值为( )A、△H2-△H1 B、△H2+△H1C、△H1-△H2 D、-△H1-△H...
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- 问题详情:已知:(1)Zn(s)+1/2O2(g)==ZnO(s),ΔH=-348.3kJ/mol (2)2Ag(s)+1/2O2(g)==Ag2O(s),ΔH=-31.0kJ/mol则Zn(s)+Ag2O(s)==ZnO(s)+2Ag(s)的ΔH等于( )A.-317.3kJ/mol B.-379.3kJ/mol C.-332.8kJ/mol D.317.3kJ/mol【回答】A知识点:燃...
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- 问题详情:已知热化学方程式:①CO(g)+1/2O2(g)=CO2(g)ΔH=-283.0kJ·mol-1②H2(g)+1/2O2(g)=H2O(g)ΔH=-241.8kJ·mol-1则下列说法正确的是 A.H2的燃烧热为241.8kJ·mol-1B.由反应①、②可知上图所示的热化学方程式为CO(g)+H2O(g)=CO2(g)+H2(g)ΔH=-41.2kJ·mol-1C.H2(g)转变成H2O(g)的化学反应一定要吸收...
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- 问题详情:5℃、101kPa下:①2Na(s)+1/2O2(g)=Na2O(s)△H1=-414k/mol②2Na(s)+O2(g)=Na2O2(s)△H2=-511kJ/mol下列说法正确的是 ( ) A.①和②生成等物质的量的产物,转移的电子数相同 B.Na与足量O2反应生成Na2O,随温度升高生成Na2O的速率逐渐加快 C. D.①和②产物中的*阳...
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- 问题详情:今有如下三个热化学方程式:H2(g)+1/2O2(g)=H2O(g);ΔH=aKJ·mol-1,H2(g)+1/2O2(g)=H2O(l);ΔH==bkJ·mol-1,2H2(g)+O2(g)=2H2O(l);ΔH==ckJ·mol-1,关于它们的下列表述正确的是A.它们都是吸热反应 B.a、b和c均为正值C.a==b D.2b==c【...
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- 问题详情:已知⑴H2(g)+1/2O2(g)=H2O(g); △H1=a kJ/mol⑵2H2(g)+O2(g)=2H2O(g); △H2=b kJ/mol⑶H2(g)+1/2O2(g)=H2O(l); △H3=c kJ/mol⑷2H2(g)+O2(g)=2H2O(l); △H4=d kJ/mol下列关系式中正确的是( )A.a<c<0 B.b>d>0 C.2a=b<0 ...
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- 问题详情:.已知下列热化学方程式:①H2(g)+1/2O2(g)=H2O(l)ΔH=-285kJ·mol-1,②H2(g)+1/2O2(g)=H2O(g)ΔH=-241.8kJ·mol-1,③C(s)+1/2O2(g)=CO(g)ΔH=-110.5kJ·mol-1,④C(s)+O2(g)=CO2(g)ΔH=-393.5kJ·mol-1,回答下列问题:(1)H2燃烧热的热化学方程式为___________;C燃烧热的热化学方程式为___________。(选数...
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- 问题详情:下列各组热化学方程式中,△H前者大于后者的是①C(s)+O2(g)=CO2(g); C(s)+1/2O2(g)=CO(g) ②S(s)+O2(g)=SO2(g); S(g)+O2(g)=SO2(g)③H2(s)+1/2O2(g)=H2O(l); 2H2(g)+O2(g)=2H2O(l)④2KOH(aq)+H2SO4(aq)=K2SO4(aq)+2H2O(l); 2KOH(aq)+H2SO4(浓)=K2SO4(aq)+2H2O(l)A.①③...
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- 问题详情:有3个热化学方程式:H2(g)+1/2O2(g)=H2O(g)△H=akJ/molH2(g)+1/2O2(g)=H2O(l)△H=bkJ/mol2H2(g)+O2(g)=2H2O(l)△H=ckJ/mol关于它们的下列表述正确的是( )A.a+b=c B.1molH2O由气态变为液态吸收(a-b)kJ热量C.a<b D.1molH2O由液态变为气态吸收(a-c/2)kJ热量【回答】...
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