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The vapour pressure of pure CHCl ₃ and CH ₂ Cl ₂ are 200 and 41.5 atm respectively. The weight of CHCl ₃ and CH ₂ Cl ₂ are 11.9 ~g and 17 ~g respectively in a solution. The vapour pressure of solution (in atm) will be

Options

  1. A80.5
  2. B79.5
  3. C94.3
  4. D105.5

Correct answer

C. 94.3

Step-by-step solution

aligned & (c) : p_ CHCl ₃ ^ o =200 ~atm ; p_ CH ₂ Cl ₂ ^ o =41.5 ~atm & n_ CHCl =11.9 / 119.5=0.1, n_ CH ₂ Cl ₂ =17 / 85=0.2 & P_T=p_A^ o x_A+p_B^ o x_B & =200 (0.1 / 0.3)+41.5 (0.2 / 0.3)=94.3 ~atm aligned

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