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Question: Answered & Verified by Expert
A liquid is immiscible in water was steam distilled at 95.2oC at a pressure of 0.983 atm. What is the mass of the liquid present per gram of water in the distillate. Molar mass of the liquid is 134.3 g/mol and the vapour pressure of water is 0.84 atm. Also, Vapour pressure of pure liquid is 0.143 atm.
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Options:
  • A 1 g
  • B 1.27 g
  • C 0.787 g
  • D 13.43 g
Solution:
1023 Upvotes Verified Answer
The correct answer is: 1.27 g
p T = 0.983 atm

p water = 0.84 atm

p liquid = 0.143 atm

Apply Dalton's law of vapour phase 

p o water p o liquid = 0.84 0.143 = n H 2 O n Liquid

0.84 0.143 = 1 18 w e 134.3 = 134.3 18 × w e

w e = 134.3 18 × 0.143 0.84 = 1.27 g

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