What mass of urea needs to be dissolved in 100g of water to decrease the vapour pressure by 25%?

Asked by  | 1st Oct, 2008, 07:28: PM

Expert Answer:

use the formula (PA0 - PA)/ PA0   = WB MA / WA MB

 PA0 is the vapour pressure of the pure solvent PAo is reduced vapour pressure on addtion of urea

WB  is the wt of urea that is added MB is the Molecular wt of the urea, put the values in the equation and find the anwer.

Answered by  | 7th Oct, 2008, 07:55: AM

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