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题型:填空题 题类:常考题 难易度:普通
用盖斯定律进行有关反应热的计算
CH≡CH(g)+H2(g)→CH2=CH2(g);△H=﹣174kJ•mol﹣1
CH≡CH(g)+2H2 (g)→C2H6(g);△H=﹣311kJ•mol﹣1
则CH2=CH2(g)+H2(g)→C2H6(g) 的反应热为.
1)C(s)+O2(g)=CO2(g)△H1=﹣393.5kJ/mol
2)CH3COOH(l)+2O2(g)=2CO2(g)+2H2O(l)△H2=﹣870.3kJ/mol
3)H2(g)+ O2(g)=H2O(l)△H3=﹣285.8kJ/mol
则反应2C(s)+2H2(g)+O2(g)=CH3COOH(l) 的反应热(焓变)为( )
① CH4(g) = C(s)+2H2(g) △H1 = + 75.0 kJ·mol-1
② CO2(g)+H2(g) = CO(g)+H2O(g) △H2 = + 41.0 kJ·mol-1
③ CO(g)+H2(g) = C(s)+H2O(g) △H3 = -131.0 kJ·mol-1
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