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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 gt y `

D

` x lt y `

Text Solution

Verified by Experts

(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) rarr CO_(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)rarrCH_(3) OH`
For `x -y lt 0 , y gt x `
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