试题 试卷
题型:单选题 题类:常考题 难易度:普通
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 .
①2H2(g)+O2(g)=2 H2O(1) ΔH1= -akJ/mol
②H2(g)+ O2(g)=H2O (g) ΔH2= -bkJ/mol
③C(s)+ O2(g)=CO(g) ΔH3 = -ckJ/mol
④C(s)+ O2 (g)=CO2(g) ΔH4= -dkJ/mol
下列说法正确的是( )
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