已知:①CO(g)+1/2O2(g)=CO2(g)△H1=-283.0kJ/mol
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:化学作业 时间:2024/08/20 06:22:25
已知:①CO(g)+1/2O2(g)=CO2(g)△H1=-283.0kJ/mol
②H2(g)+1/2O2(g)=H2O(l)△H2=-285.8kJ/mol
③C2H5OH(l)+3O2(g)=2CO2(g)+3H2O(l)△H3=-1370kJ/mol.
则2CO(g)+4H2(g)=H2O(l)+C2H5OH(l)的△H为( )
A.-339.2 kJ/mol
B.-1983.8kJ/mol
C.+518.2kJ/mol
D.-801.2kJ/mol
②H2(g)+1/2O2(g)=H2O(l)△H2=-285.8kJ/mol
③C2H5OH(l)+3O2(g)=2CO2(g)+3H2O(l)△H3=-1370kJ/mol.
则2CO(g)+4H2(g)=H2O(l)+C2H5OH(l)的△H为( )
A.-339.2 kJ/mol
B.-1983.8kJ/mol
C.+518.2kJ/mol
D.-801.2kJ/mol
![已知:①CO(g)+1/2O2(g)=CO2(g)△H1=-283.0kJ/mol](/uploads/image/z/16171485-69-5.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9A%E2%91%A0CO%EF%BC%88g%EF%BC%89%2B1%2F2O2%EF%BC%88g%EF%BC%89%3DCO2%EF%BC%88g%EF%BC%89%E2%96%B3H1%3D-283.0kJ%2Fmol)
①CO(g)+
1
2O2(g)=CO2(g)△H1=-283.0kJ/mol
②H2(g)+
1
2O2(g)=H2O(l)△H2=-285.8kJ/mol
③C2H5OH(l)+3O2(g)=2CO2(g)+3H2O(l)△H3=-1370kJ/mol.
根据盖斯定律,①×2-③+②×4得2CO(g)+4H2(g)=H2O(l)+C2H5OH(l)△H.=2△H1-△H3+4△H2;
故△H.=2△H1-△H3+4△H2=2×(-283.0kJ/mol)-(-1370kJ/mol)+4×(-285.8kJ/mol)=-339.2kJ/mol,
故选A.
1
2O2(g)=CO2(g)△H1=-283.0kJ/mol
②H2(g)+
1
2O2(g)=H2O(l)△H2=-285.8kJ/mol
③C2H5OH(l)+3O2(g)=2CO2(g)+3H2O(l)△H3=-1370kJ/mol.
根据盖斯定律,①×2-③+②×4得2CO(g)+4H2(g)=H2O(l)+C2H5OH(l)△H.=2△H1-△H3+4△H2;
故△H.=2△H1-△H3+4△H2=2×(-283.0kJ/mol)-(-1370kJ/mol)+4×(-285.8kJ/mol)=-339.2kJ/mol,
故选A.
已知下列两个化学方程式:2CO(g)+O2(g)=2CO2(g) △H=-563.6kJ/mol
根据下列热化学方程式(1)C(s)+O2(g)=CO2(g)△H1=-393.5kJ/mol(2)H2(g)+12
已知 ①C2H5OH(g)+3O2(g)==2CO2(g)+3H2O(g);△H1=-a kJ/mol; ②H2O(g)
化学H2(g)+2/1O2(g)==H2O(g)△H1=-241.8kj/mol
(1)CH4(g)+2O2(g)=CO2(g)+2H2O(l),△H1=-890.3kj/mol
已知:CH4(g)+2O2(g)=CO2(g)+2H2O(l)△H=-890.3 KJ*mol-1H2(g)+0.5O2
已知2H2(g)+O2(g)==2H2O(l) △H=-571.6KJ/mol CO(g)+1/2O2(g)==CO2(
N2(g)+2O2(g)=2NO2……① △H1=+67.7kJ/mol
已知2H2(g)+O2(g)=2H2O(l);△H=-571.6kJ/mol,C3H8(g)+5O2(g)=3CO2(g
已知①2C(s)+O2(g)==2CO(g) △H=-221.0KJ/mol
已知 (1) 标况下 2C(s)+O2(g)==2CO2(g) △H=-221KJ/mol
CO(g)的燃烧热是283.0kJ/mol,则2CO2(g)═2CO(g)+O2(g)反应的△H=+566.0kJ/mo