How many grams of urea [(NH2)2CO] must be added to 465g of of water to give a solution with a vapor pressure of .865 mmHg lower than that of?
pure water at 30 degrees Celsius. (The vapor pressure of water at 30 degrees Celsius is 31.8 mmHg)

Question

How many grams of urea [(NH2)2CO] must be added to 465g of of water to give a solution with a vapor pressure of .865 mmHg lower than that of?
pure water at 30 degrees Celsius. (The vapor pressure of water at 30 degrees Celsius is 31.8 mmHg)

aaronq · Answer

use Raoult's Law http://chemwiki.ucdavis.edu/Physical_Chemistry/Physical_Properties_of_Matter/Solutions_and_Mixtures/Ideal_Solutions/Changes_In_Vapor_Pressure,_Raoult's_Law

anonymous · Answer

How can I apply that?

aaronq · Answer

did you read through it? there are examples near the bottom

anonymous · Answer

I did but I can't seem to relate it