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The enthaply at 298K of the reaction H...

The enthaply at `298K` of the reaction
`H_(2)O_(2)(l)rarr+(1)/(2)O_(2)(g)`
is `-23.5Kcal mol^(-1)` and the enthaply of formation of `H_(2)O_(2)(l)` is `-44.8Kcal mol^(-1)` . The enthaply of formatiom of `H_(2)O(l)` is

A

`-68.3Kcalmol^(-1)`

B

`68.3Kcalmol^(-1)`

C

`-91.8Kcalmol^(-1)`

D

`91.8Kcalmol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaH_(reaction)=DeltaH_(f)^(@)(H_(2)O_(2))-DeltaH_(f)^(@)(H_(2)O_(2))`
`-23.5=x-(-44.8)`
or `x=-23.5-44.8=-68.3`
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