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
②S(s)+O2(g)═SO2(g)△H3 S(g)+O2(g)═SO2(g)△H4
③H2(g)+O2(g)═H2O(l)△H5 2H2(g)+O2(g)═2H2O(l)△H6
④CaCO3(s)═CaO(s)+CO2(g)△H7 CaO(s)+H2O(l)═Ca(OH)2(s)△H8 .
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( )
① Sn(s , 白)+2HCl(aq)=SnCl2(aq)+H2(g) △H1
② Sn(s , 灰)+2HCl(aq)=SnCl2(aq)+H2(g) △H2
③ Sn(s , 灰) Sn(s , 白) △H3=+2.1 kJ·mol-1
下列说法正确的是( )
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