Question

Vapour pressure of water at 20 C is 17.5 mm Hg. Calculate the vapour pressure of water at 20 C when 15 g of glucose is dissolved in 150 g of water.​

Answer 1

by using raoult's law we can calculate a solution vapour pressure of 16.mm.Hg.

EXPLANATION:

mole fraction of sucrose:

=moles of sucrose/moles of sucrose + moles of water

Xsucrose=200.g/200.g/342.13.g.mol^-1+112.3.g/18.01.g.mol^-1=0.914
Xsucrose+Xwater=1
because sucrose is involatile,the vapour pressure of the solution is proportional to the mole fraction of water:
Psolution =Xwater×17.5.mm.g

Answer 2

Answer:

Explanation: apply formula only...