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What is the vapour pressure of an aqueous solution of sucrose with mole fraction 0.2?
The vapour pressure of water at room temperature is 23.8mm Hg.

What is the vapour pressure of an aqueous solution of sucrose with mole fraction 0.2?<br/>
The vapour pressure of water at room temperature is 23.8mm Hg.

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1. 19.04 mm Hg
B. 24.2 mm of Hg
C. 21.42 mm of Hg
D. 21.4 mm of Hg

This question is part of PRE NET 2015 MEDICAL By Taleem Tutor
Asked by Ejazmoaz, Last updated: May 21, 2020

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2 Answers

J.Spencer

Knowledge Enthusiast, Knows A Lot of Stuff.

J.Spencer, Knowledge enthusiast, Tokyo

Answered Jul 02, 2018

The answer is A.19.04 mm Hg.

According toRaoult's law, the vapor pressure (p) in a solution with a non-volatile solute is equal to the product of mole fraction of solvent (x1) and vapor pressure of the solvent (p1).

Therefore,

p= p1x1

Now,

Given:

Vapour pressure of Water (p1): 23.8mmHg

Mole fraction of sugar (x2) = 0.2

Hence,

Mole Fraction of Water (x1) = 1-x2 = 1-0.2= 0.8.

Thus,

p = p1x1

p= 23.80.8

p= 19.04

Hence, the vapor pressure of the aqueous solution is 19.04 mm Hg.

 

John Smith

John Smith

Answered Jan 03, 2017

19.04 mm Hg
 1

John Adney

John Adney

Replied on Jun 26, 2017

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