已知:(l)H2(g)+1/2 O2(g) =H2O(g) △H1=a kJ· (2)2H2(g)+O2(g) =2H2O(g) △H2=b kJ· (3)H2(g)+1/2 O2(g)=H2O(l) △H3=c kJ· (4)2H2(g)+O2(g) =2H2O(l) △H4=d kJ· 下列关系式中正确的是( )A.a<c<0 B.b>d>0 C.b=2a<0 D.d=2c>0 查看更多

 

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已知:(1)H2(g)+1/2O2(g) ====H2O(g) ΔH1=a kJ·mol-1

(2)2H2(g)+O2(g) ====2H2O(g) ΔH2=b kJ·mol-1

(3)H2(g)+1/2O2(g) ====H2O(l) ΔH3=c kJ·mol-1

(4)2H2(g)+O2(g) ====2H2O(l) ΔH4=d kJ·mol-1

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

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已知:
(1) H2(g)+1/2O2(g)===H2O(g) ΔH1a kJ/mol;
(2) 2H2(g)+O2(g)===2H2O(g) ΔH2b kJ/mol;
(3) H2(g)+1/2O2(g)===H2O(l) ΔH3c kJ/mol;
(4) 2H2(g)+O2(g)===2H2O(l) ΔH4d kJ/mol
下列关系式中正确的是

A.ac<0B.bd>0C.2ab<0 D.2cd>0

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已知:

(1) H2(g)+1/2O2(g)===H2O(g) ΔH1a kJ/mol;

(2) 2H2(g)+O2(g)===2H2O(g) ΔH2b kJ/mol;

(3) H2(g)+1/2O2(g)===H2O(l) ΔH3c kJ/mol;

(4) 2H2(g)+O2(g)===2H2O(l) ΔH4d kJ/mol

下列关系式中正确的是

A.ac<0   B.bd>0         C.2ab<0           D.2cd>0

 

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已知:
(1) H2(g)+1/2O2(g)===H2O(g) ΔH1a kJ/mol;
(2) 2H2(g)+O2(g)===2H2O(g) ΔH2b kJ/mol;
(3) H2(g)+1/2O2(g)===H2O(l) ΔH3c kJ/mol;
(4) 2H2(g)+O2(g)===2H2O(l) ΔH4d kJ/mol
下列关系式中正确的是
A.ac<0B.bd>0C.2ab<0 D.2cd>0

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 已知:

(1) H2(g)+1/2O2(g)===H2O(g) ΔH1a kJ/mol;

(2) 2H2(g)+O2(g)===2H2O(g) ΔH2b kJ/mol;

(3) H2(g)+1/2O2(g)===H2O(l) ΔH3c kJ/mol;

(4) 2H2(g)+O2(g)===2H2O(l) ΔH4d kJ/mol

下列关系式中正确的是

A.ac<0   B.bd>0         C.2ab<0           D.2cd>0

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