What is the vapour pressure of an aqueous solution of sucrose with - ProProfs Discuss  + Ask Question

# What is the vapour pressure of an aqueous solution of sucrose with mole fraction 0.2? Change Image    Delete

Asked by Ejazmoaz, Last updated: Aug 04, 2021

### Request 0Follow Share     Answer AnonymouslyAnswer Later Copy Link  J.Spencer, Knowledge enthusiast, Tokyo

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= p1*x1

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 = p1*x1

p= 23.8*0.8

p= 19.04

Hence, the vapor pressure of the aqueous solution is 19.04 mm Hg.   John Smith 19.04 mm Hg    Search for Google images Select a recommended image
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