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Acetic acid ( C H 3 C O O H ) is partially dimerised to C H 3 C O O H 2 in the vapour phase. At a total pressure of 0 .200 atm , acetic acid is 92 .0% dimerized at 298 K . The value of equilibrium constant of dimerization under these conditions is

Options

  1. A57.5 atm − 1
  2. B9.7 atm − 1
  3. C97 atm − 1
  4. D194   atm − 1

Correct answer

D. 194   atm − 1

Step-by-step solution

According to question; 0 .46 a + 0 .08 a = 0 .2 ∴ a = 0.2 0.54 K P = 0.46 × 0.2 0.54 0.08 × 0.2 0.54 2 =194 atm − 1

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