已知(1) ===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(1) ===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 |