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moles of liquid X and moles of liquid Y make a solution having a vapour pressure of . The vapour pressures of pure X and Y are and respectively. Which of the following is true regarding the described solution?

  1. A
    The solution shows positive deviation.
  2. B
    The solution shows negative deviation.
  3. C
    The solution is ideal.
  4. D
    The solution has volume greater than the sum of individual volumes.

Solution & Step-by-step Explanation

1. Calculate mole fractions: and .2. Calculate ideal vapour pressure using Raoult's law:


3. Compare with observed pressure: .Since , the solution shows negative deviation from Raoult's law.

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Try it yourself before checking the explanation above.

moles of liquid X and moles of liquid Y make a solution having a vapour pressure of . The vapour pressures of pure X and Y are and respectively. Which of the following is true regarding the described solution?
A
The solution shows positive deviation.
B
The solution shows negative deviation.
C
The solution is ideal.
D
The solution has volume greater than the sum of individual volumes.

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Raoult's LawVapor PressureLiquid Solutions

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