On the basis of the following thermochemical data : (∆_f G^o H_{(a q)}^{+}=0) {\H}_2 {\O}( {\l}) \to {\H}^{+}( {\aq})+ {\OH}^{-}( {\aq}) ; ∆ H=57.32 {\kJ} {\H}_2( {\g})+\frac{1}{2} O_2(g) \to {\H}_2 {\O}( {\l}) ; ∆ H=-286.20 {\kJ} The value of enthalpy of formation of {\OH}^{-}ion at 25^{\circ} {\C} is [AIEEE 2009]

Correct Answer is : −228.88kJ

AIEEE 2009 Solved Paper

Section: Chemistry

Question : 5 of 89

Marks: +1, -0

On the basis of the following thermochemical data :
‌(∆fGoH(aq)+=0)
‌H2O(l)→H+(aq)+OH−(aq);∆H=57.32‌kJ
‌H2(g)+‌

O2(g)→H2O(l);∆H=−286.20‌kJ
The value of enthalpy of formation of OH−ion at 25∘C is

[AIEEE 2009]

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