The enthalpy of neutralisation of a strong acid by a strong base B − 57 kJ / mol . Enthalpy of formation of H 2 O is − 285 kJ / mol . The enthalpy of formation of aqueous hydroxyl ion is -

Question

The enthalpy of neutralisation of a strong acid by a strong base B − 57 kJ / mol . Enthalpy of formation of H 2 ​ O is − 285 kJ / mol . The enthalpy of formation of aqueous hydroxyl ion is -

TestHub · Accepted Answer

Enthalpy of neutralisation of strong acid by a strong base $= - 57 kJ / mol$

Enthalpy of formation of $H_{2} O = - 285 kJ / mol$

Let enthalpy of formation of aq Hydroxyl ion $= x$

$\Rightarrow H^{+} (aq) + OH^{-} (aq) ⇌ H_{2} O$

$\Rightarrow Δ H$ reaction $= Σ$ Heat of formation of products $- Σ$ Heat of formation of Reactions. $\Rightarrow - 57 = - 285 - (x + 0)$

$\Rightarrow x = 228 kJ / mol$

So, enthalpy of formationof Hydroxyl ion $= 228 kJ / mol$

Chemistry - Thermochemistry Question with Solution | TestHub

Options:

Doubts & Discussion