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Enthalpy of CH(4)+(1)/(2)O(2)rarrCH(3)OH...

Enthalpy of `CH_(4)+(1)/(2)O_(2)rarrCH_(3)OH` is
negative. If enthalpy of combustion of `CH_(4)` and `CH_(3)OH` are `x` and `y` respectively, then which relation is correct?

A

`xgty`

B

`xlty`

C

`x=y`

D

`xgey`

Text Solution

Verified by Experts

The correct Answer is:
B
`CH_(4)+O_(2)toCO_(2)+2H_(2)O`, `DeltaH_(1)=-xkJ……(i)`
`CH_(3)OH+O_(2)+CO_(2)+2H_(2)O`, `DeltaH_(2)=-y kJ……..(ii)`
Subtract `(ii)` from `(i)`
We get
`CH_(4)+(1)/(2)O_(2)toCH_(3)OH`, `DeltaH_(3)=-ve`
or `-x-(-y)=-ve`
or `y-x=-ve`
Hence `x gt y`
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