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kotesh marikala Grade: 12

vapour pressure of water at293k is 17.53mm .calculate the vapour pressure of solution at 293k containing 6g of urea in 100g of water?

7 years ago

Answers : (2)

rohit kantheti
20 Points

use roults know the pure vapour pressure of the solvent(17.53mm).,can find out mole fraction of the solute and hence can get the apour pressure of the solute

7 years ago
879 Points

Dear student,

  • Raoult's Law states that for an ideal solution the partial vapor pressure of a component in solution is equal to the mole fraction of that component times its vapor pressure when pure: Pa = XaPao
    Pa = vapor pressure of the solution
    Pao = vapor pressure of pure solvent
    Xa = mole fraction of the solvent

  • The fractional vapor pressure lowering is equal to the mole fraction of the solute: Xb = (Pao - Pa) ÷ Pao
    Pa = vapor pressure of the solution
    Pao = vapor pressure of pure solvent
    Xb = mole fraction of the solute

  • Fractional vapor pressure lowering can be used to calculate molecular mass (formula weight) of a solute.


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Sagar Singh

B.Tech, IIT Delhi

7 years ago
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