已知 (l)=H2O(g)△H1=a kJ· (2)=2H2O(g)△H2=b
题型:选择题
问题:
已知
(l) =H2O(g) △H1=a kJ·
(2) =2H2O(g) △H2=b kJ·
(3)=H2O(l) △H3=c kJ·
(4) =2H2O(l) △H4=d kJ·
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
已知
(l) =H2O(g) △H1=a kJ·
(2) =2H2O(g) △H2=b kJ·
(3)=H2O(l) △H3=c kJ·
(4) =2H2O(l) △H4=d kJ·
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