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29/09/2021 12:09 pm
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The enthalpy of neutralisation of NH4OH and CH3COOH is -10.5 kcal mol–1 and enthalpy of neutralisation of CH3COOH with strong base is -12.5 kcal mol–1. The enthalpy of ionisation of NH4OH will be
(a) 3.2 kcal mol–1
(b) 2.0 kcal mol–1
(c) 3.0 kcal mol–1
(d) 4.0 kcal mol–1
1 Answer
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29/09/2021 12:15 pm
Correct answer: (b) 2.0 kcal mol–1
Explanation:
ΔneuH for strong base and strong acid
= -13.7 1 kcaleq-1
ΔHion(CH3COOH)
= -12.5 - (-13.7) = 1.2 kcal mol-1
ΔHion(CH3COOH)
= -10.5 - (-13.7) - ΔHion(CH3COOH)
= 13.7 - 10.5 - 1.2
= 2 k cal mol-1