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The enthalpy of neutralisation of a strong acid by a string base is `-57.32 kJ mol^(-1)`. The enthalpy of formation of water is `-285.84 kJ mol^(-1)`. The enthalpy of formation of hydroxyl ion isA. `+ 228.52 KJ//mol`B. `- 114.26 KJ//mol`C. `- 228.52 KJ//mol`D. `+ 114.2 KJ//mol` |
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Answer» Correct Answer - C `H^(+) (aq). + OH^(-) (aq) rarr H_(2)O (l)` `Delta_(r )H = Delta_(f)H_(H_(2)O) - (Delta_(f)H_((H^(+)(aq))) + Delta_(f)H_((OH^(-))))` `-57.32 = 285.84 - (0 + Delta_(f)H_((OH^(-)(aq))))` `Delta_(f)H_(OH^(-)(aq)) = -228.52 KJ//mol` |
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