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· 下列關(guān)系式中正確的是 C A.a(chǎn)<c<0 B.b>d>0 C.2a=b<0 D.2c=d>0 查看更多

 

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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
下列關(guān)系式中正確的是

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

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已知:⑴H2(g) + 0.5O2(g) =H2O(g) △H1=a kJ/mol,  ⑵2H2(g) + O2(g) = 2H2O(g)△H2=b kJ/mol,⑶H2(g) + 0.5O2(g) =H2O(l) △H3=c kJ/mol

⑷2H2(g) + O2(g) = 2H2O(l) △H4=d kJ/mol,下列關(guān)系式中正確的是

A.a(chǎn)<c<0       B.b>d>0       C.2a=b<0       D.2c=d>0

 

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已知:

(l)H2(g)+O2(g)=H2O(g)          △H1=a kJ·  [來源:]

(2)2H2(g)+ O2(g)=2H2O(g)         △H2=b kJ·

(3)H2(g)+O2(g)=H2O(l)          △H3=c kJ· 

(4)2H2(g)+ O2(g)=2H2O(l)         △H4=d kJ·

下列關(guān)系式中正確的是 

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

下列關(guān)系式中正確的是

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

 

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已知:⑴H2(g) + 0.5O2(g) =H2O(g) △H1=a kJ/mol, ⑵2H2(g) + O2(g) = 2H2O(g)△H2=b kJ/mol,⑶H2(g) + 0.5O2(g) =H2O(l) △H3=c kJ/mol
⑷2H2(g) + O2(g) = 2H2O(l) △H4=d kJ/mol,下列關(guān)系式中正確的是

A.a(chǎn)<c<0 B.b>d>0 C.2a=b<0 D.2c=d>0

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