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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 `:`

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On the basis of the following thermochemical data [(Delta_(f)G^(@)H^(+) (aq) = 0] H_(2)O (l) rarr H^(+) (aq), Delta H = 57.32 kJ H_(2) (g) + (1)/(2)O_(2) (g) rarr H_(2)O (l), Delta H = - 286 kJ The value of enthalpy of formation of OH^(-) at 25^(@)C is