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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

`x gt y`

B

`x lty`

C

`x=y`

D

`x gey`

Text Solution

Verified by Experts

The correct Answer is:
B
(i) `CH_(4) + 2O_(2)rarr CO_(2)+ 2H_(2)O , DeltaH= x`
(ii) `CH_(3) OH + (3)/(2) O_(2) rarr CO_(2)+ 2H_(2)O, DeltaH =y`
(i) - (ii) gives `DeltaH ` for the given reaction, i.e., `DeltaH = x-y `.As it is -ve , `x lty`
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