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Enthalpy of neutralisation of \( \mathrm{CH}_{3} \mathrm{COOH} \) by \( \mathrm{NaOH} \)
P is \( -50.6 \mathrm{~kJ} / \mathrm{mol} \) and the heat of neutralisation of a

W strong acid with \( \mathrm{NaOH} \) is \( -55.9 \mathrm{~kJ} / \mathrm{mol} \). The value of \( \Delta \mathrm{H} \) for the ionisation of \( \mathrm{CH}_{3} \mathrm{COOH} \) is
(1) \( 3.5 \mathrm{~kJ} / \mathrm{mol} \)
(2) \( 4.6 \mathrm{~kJ} / \mathrm{mol} \)
(3) \( 5.3 \mathrm{~kJ} / \mathrm{mol} \)
(4) \( 6.4 \mathrm{~kJ} / \mathrm{mol} \)
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