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Enthalpy of the reaction CH(4)+(1)/(2)...

Enthalpy of the reaction
`CH_(4)+(1)/(2)O_(2) to CH_(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 ge y`

B

`x =y`

C

`x gty`

D

`x lty`

Text Solution

Verified by Experts

The correct Answer is:
D
(i) `CH_(4)(g)+2O_(2)(g)rarr CO_(2)(g)+2H_(2)O(l),Delta_("comb")H=x`
(ii) `CH_(3)OH(l)+(3)/(2)O_(2)(g)rarrCO_(2)(g)+2H_(2)O(l), Delta_("comb")H=y`
Reversing reaction (ii) and adding it in (i),
`DeltaH_("reaction")=x-y" for "CH_(4)+(1)/(2)O_(2)rarr CH_(3)OH`
For `x-y lt 0, y gt x`
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