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On the basis of the following thermochem...

On the basis of the following thermochemical data `:` `(Delta_(f)G^(@)H_((aq.))^(+)=0)`
`H_(2)O_((l))rarr H_((aq.))^(+)+OH_((aq.))^(-),DeltaH=57.32kJ`
`H_(2(g))+(1)/(2)O_(2(g))rarrH_(2)O_((l)),DeltaH=-286.20kJ`
The value of enthalpy of formation of `OH^(-)` ion at `25^(@)C` is `:`

A

`- 22.88 kJ `

B

` 228.88 kJ`

C

` +228.88 kJ`

D

` - 343.52kJ`

Text Solution

Verified by Experts

The correct Answer is:
b
From 1st reaction,
`Delta_(r)H= [Delta_(f) H(H^(+))+Delta_(f)H^(@) ( OH^(-)) ]-Delta_(f)H^(@) (H_(2)O)`
`:. 57.32 =0+ Delta_(f)H^(@) ( OH^(-)) - ( -286.2)`
or `Delta_(f)H^(@) ( OH^(-)) =57.32 -286.2 = -228.88 kJ `
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