已知(1)H2(g)+O2(g)==H2O(g) ΔH1 =a kJ·mol-1? (2)2H2(g)+O2(g)==2H2O(g) ΔH2 =b kJ·mol-1?? (3)H2(g)+O2(g)==H2O(l) ΔH3 =c kJ·mol-1?? (4)2H2(g)+O2(g)==2H2O(l) ΔH4 =d kJ·mol-1?? 下列關系式中正確的是( ) 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:(1)H2(g)+====H2O(g)

ΔH1=a kJ·mol-1

(2)2H2(g)+O2(g)====2H2O(g)

ΔH2=b kJ·mol-1

(3)H2(g)+====H2O(l)

ΔH3=c kJ·mol-1

(4)2H2(g)+O2(g)2H2O(l)

ΔH4=d kJ·mol-1

下列關系式中正確的是(    )

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)+H2O(g) ΔH1="a" kJ·mol-1
(2)2H2(g)+O2(g)=2H2O(g)  ΔH2="b" kJ·mol-1
(3)H2(g)+=H2O(l)  ΔH3="c" kJ·mol-1
(4)2H2(g)+O2(g)2H2O(l)  ΔH4="d" kJ·mol-1
下列關系式中正確的是(   )
A.a(chǎn)<c<0B.b>d>0C.2a=b<0D.2c=d>0

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已知:(1)H2(g)+====H2O(g)
ΔH1="a" kJ·mol-1
(2)2H2(g)+O2(g)====2H2O(g)
ΔH2="b" kJ·mol-1
(3)H2(g)+====H2O(l)
ΔH3="c" kJ·mol-1
(4)2H2(g)+O2(g)2H2O(l)
ΔH4="d" kJ·mol-1
下列關系式中正確的是(   )
A.a(chǎn)<c<0B.b>d>0C.2a=b<0D.2c=d>0

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已知??

(1)H2(g)+O2(g)H2O(g);ΔH1=a kJ·mol-1??

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

(3)H2(g)+O2(g)H2O(l);ΔH3=c kJ·mol-1??

(3)2H2(g)+O2(g)2H2O(l);ΔH4=d kJ·mol-1??

下列關系式正確的是(  )

A. a<c<0?           B. b>d>0??

C. 2a=b<0?                              D.2c=d>0??

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已知下列熱化學方程式:

(1)CH3COOH(l)+2O2(g)==2CO2(g)+2H2O(l)     △H1= -870 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 kJ·mol-1

則反應2C(s)+2H2(g)+O2(g) ==CH3COOH(l) 的反應熱△H為(   )

A. —243.5 kJ·mol-1    B.—487 kJ·mol-1    C. —1113.5 kJ·mol-1    D. —2227 kJ·mol-1

 

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