12.已知 (1)H2(g)+1/2O2(g)=H2O(g) △H1=a kJ/mol (2)2H2(g)+O2(g)=2H2O(g) △H2=b kJ/mol (3)H2(g)+1/2O2(g)=H2O(l) △H3=c kJ/mol (4)2H2(g)+O2(g)=2H2O(l) △H4=d kJ/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 查看更多

 

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已知
⑴ H2(g)+1/2 O2(g)====H2O(g) ; △H1=a kJ·mol-1
⑵ 2H2(g)+ O2(g)===2H2O(g) ; △H2=b kJ·mol-1
⑶ H2(g)+1/2O2(g)====H2O(l) ; △H1=c kJ·mol-1
⑷ 2H2(g)+ O2(g)===2H2O(l) ; △H2=d kJ·mol-1
下列关系式中正确的是
[     ]
A.a<b<0
B.b>d>0
C.2a=b<0
D.2c=d>0

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已知⑴H2(g)+ 1/2 O2(g)=H2O(g);   △H1=a  kJ/mol

⑵2H2(g)+ O2(g)=2H2O(g);    △H2=b  kJ/mol

⑶H2(g)+ 1/2O2(g)=H2O(l);    △H3=c  kJ/mol

⑷2H2(g)+ O2(g)=2H2O(l);     △H4=d  kJ/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         

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已知下列热化学方程式:

(1)CH3COOH(l)+2O2(g) == 2CO2(g)+2H2O(l)  ΔH1=-870.3 kJ·mol-1

(2)C(s)+ O2(g) == CO2(g)  △H2=-393.5 kJ•mol-1

(3)H2(g) +O2(g) == H2O(l)  △H3=-285.8kJ·mol-1

则反应2 C(s)+2H2(g) +O2(g) == CH3COOH(l)的△H为(    )

A. -488.3 kJ·mol-1 B.-244.15 kJ·mol-1  C.+488.3 kJ·mol-1 D.+244.15 kJ·mol-1

 

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已知下列热化学方程式:
(1)CH3COOH(l)+2O2(g) == 2CO2(g)+2H2O(l)  ΔH1=-870.3 kJ·mol-1
(2)C(s)+ O2(g) == CO2(g) △H2=-393.5 kJ?mol-1
(3)H2(g) +O2(g) == H2O(l) △H3=-285.8kJ·mol-1
则反应2 C(s)+2H2(g) +O2(g) == CH3COOH(l)的△H为(   )
A.-488.3 kJ·mol-1B.-244.15 kJ·mol-1C.+488.3 kJ·mol-1D.+244.15 kJ·mol-1

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已知:
(1) H2(g)+1/2O2(g)===H2O(g) ΔH1=a kJ/mol;
(2) 2H2(g)+O2(g)===2H2O(g) ΔH2=b kJ/mol;
(3) H2(g)+1/2O2(g)===H2O(l) ΔH3=c kJ/mol;
(4) 2H2(g)+O2(g)===2H2O(l) ΔH4=d kJ/mol
下列关系式中正确的是


  1. A.
    a<c<0
  2. B.
    b>d>0
  3. C.
    2a=b<0
  4. D.
    2c=d>0

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