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At 48 ° C the vapour pressure of pure C S 2 is 850 torr. A solution of 2.0 g of sulphur in 100 g of C S 2 has a vapour pressure 844.9 torr. Determine the atomicity of sulphur molecule :

Options

  1. A1
  2. B2
  3. C4
  4. D8

Correct answer

D. 8

Step-by-step solution

Δ P = 5.1 torr ; x is atomicity of sulphur. Δ P P A ∘ = 5.1 850 = X B = 2 3 2 x 2 3 2 x + 1 0 0 7 6 5.1 850 ≅ 2 3 2 x × 7 6 1 0 0 x = 2 × 7 6 3 2 × 1 0 0 × 8 5 0 5.1 = 7.92 ≈ 8

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