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The enthalpy of neutralization of NH 4 OH and CH 3 COOH is - 10 . 5 kcal mol - 1 ​ and enthalpy of neutralisation of NH 4 OH with a strong acid is - 11 . 7 kcal mol - 1 . The enthalpy of ionization of CH 3 COOH will be

Options

  1. A4 . 0 kcal mol - 1
  2. B3 . 0 kcal mol - 1
  3. C1 . 2 kcal mol - 1
  4. D3 . 2 kcal mol - 1

Correct answer

C. 1 . 2 kcal mol - 1

Step-by-step solution

Enthalpy of neutralisation is the amount of energy released during the combination of one moe strong monobasic acid neutralised with the one-mole strong monoacidic base. H + aq + OH - aq → H 2 O l ∆ neut . H = - 13 . 7 kcal Enthalpy of ionisation of CH 3 COOH & NH 4 OH together = - 10.5 - - 13.7 = + 3.2 Kcal Enthalpy of ionisation of only NH 4 OH = - 11.7 - - 13.7 = + 2 Kcal Enthalpy of ionisation of only CH 3 COOH = 3.2 - 2 = 1 . 2 Kcal

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