试题 试卷
题型:单选题 题类:常考题 难易度:普通
P4(白磷,s)+5O2(g)═2P2O5(s);△H=﹣a kJ•mol﹣1
4P(红磷,s)+5O2(g)═2P2O5(s);△H=﹣b kJ•mol﹣1 .
①C(s)+O2(g)═CO2(g)△H1; C(s)+O2(g)═CO(g)△H2
②2H2(g)+O2(g)═2H2O(g)△H1; 2H2(g)+O2(g)═2H2O(l)△H2
③H2(g)+Cl2(g)═2HCl(g)△H1; H2(g)+l2(g)═HCl(g)△H2
④CaCO3(s)═CaO(s)+CO2(g)△H1; CaO(s)+H2O(l)═Ca(OH)2(s);△H2 .
①C2H4(g)⇌C2H2(g)+H2(g),
②2CH4(g)⇌C2H4(g)+2H2(g).当升高温度时,①和②式皆向右移动.
(1)C(s)+2H2(g)⇌CH4(g)△H1
(2)2C(s)+H2(g)⇌C2H2(g)△H2
(3)2C(s)+2H2(g)⇌C2H4(g)△H3
下列有关(1)、(2)和(3)中的△H1、△H2、△H3大小顺序排列正确的是( )
2C(石墨,s)+H2(g)═C2H2(g);△H=b
2C(石墨,s)+2H2(g)═C2H4(g);△H=c
已知:a>c>b,对下列反应:C2H2(g)+H2(g)═C2H4(g);△H=x
2CH4(g)═C2H4(g)+2H2(g);△H=y
判断正确的是( )
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