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N 2 O 4 is dissociated to 33% and 40% at total pressure P 1 and P 2 atm respectively. Then the ratio P 1 / P 2 is

Options

  1. A7/4
  2. B7/3
  3. C8/3
  4. D8/5

Correct answer

D. 8/5

Step-by-step solution

K P = ( n N O 2 ) 2 n N 2 O 4 × P Σ n 1 For 33% dissociation K P = ( 2 × 0.33 ) 2 0.67 × P 1.33 For 40% dissociation K P = ( 2 × 0.40 ) 2 0.60 × P 1.40 So P 1 P 2 = 1.56 ≃ 1.60 = 8 5 .

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