How to calculate the vapor pressure of the water in the urea solution?
October 14th, 2008
Chemistry Tutor Site - Chemistry Homework Help
A 650 ml aqueous solution contains 70 g of urea CO(NH2)2. The vapor pressure of pure water at 20.0 degrees C is 17.5 mm Hg. What is the vapor pressure of the water in the urea solution? (assume that the molar concentration of water in this solution is 55.5 M)
Chemistry Tutor Site - Chemistry Homework Answer
Moles urea = 70 g /60.07 g/mol =1.17
Moles water = 55.5 x 0.650 L =36.1
Mole fraction water = 36.1 / 36.1 + 1.17 =0.969
p = p°X = 17.5 x 0.969 = 17.0 mm Hg
Entry Filed under: Colligative Properties of Solution
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