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A solution is prepared containing a 2:1 mol ratio of dibromo ethane ( C 2 H 4 B r 2 ) and dibromo propane ( C 3 H 6 B r 2 ) what is the total vapour pressure over the solution assuming ideal behaviour? Vapour pressure (mm Hg) C 2 H 4 B r 2 173 C 3 H 6 B r 2 127

Options

  1. A300 mm Hg
  2. B158 mm Hg
  3. C150 mm Hg
  4. D142 mm Hg

Correct answer

B. 158 mm Hg

Step-by-step solution

P = P A + P B = P A 0 X A + P B 0 X B = 173 × 2 3 + 127 × 1 3 = 346 + 127 3 = 473 3 = 157.6 ≈ 158 mm of Hg

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