知(1)H2(g)+O2(g)=H2O(g);△H1=akJ/mol,(2)2H2(g)+O2(g)=2H2O(g);△H2=bkJ/mol
(3)H2(g)+O2(g)=H2O(l);△H3=ckJ/mol,(4)2H2(g)+O2(g)=2H2O(l);△H4=dkJ/mol
下列关系式中正确的是 ( )
A.a<c<0 | B.b>d>0 | C.2a="b<0" | D.2c=d>0 |
知(1)H2(g)+O2(g)=H2O(g);△H1=akJ/mol,(2)2H2(g)+O2(g)=2H2O(g);△H2=bkJ/mol
(3)H2(g)+O2(g)=H2O(l);△H3=ckJ/mol,(4)2H2(g)+O2(g)=2H2O(l);△H4=dkJ/mol
下列关系式中正确的是 ( )
A.a<c<0 | B.b>d>0 | C.2a="b<0" | D.2c=d>0 |