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Cristol
Cristol asked in Science & MathematicsChemistry · 1 decade ago

How to find mol fraction if you are given Vapor pressure of solution and vapor pressure of h20? Plz help?

The problm is this:

A solution containing ethylene glycol and water has a vapor pressure of 7.88 torr @ 10 Celsius. Pure water has a vapor pressure of 9.21 torr @ 10 Celsius. What is the mole fraction of ethylene glycol in the solution??

I just cannot figure out how to set this problem up....I'm so lost :(

2 Answers

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  • Dr.A
    Lv 7
    1 decade ago
    Favorite Answer

    p = p°X

    7.88 = 9.21 X

    X = mole fraction water = 0.856

    mole fraction ethylene glycol = 1 - 0.856=0.144

  • peadon
    Lv 4
    5 years ago

    use roults regulation : PA=P`A*XA PB=P`B*XB P`A=vapour rigidity of the organic solvent(benzene) P`B=vapour rigidity of the organic solute(toluene) XA & XB are mole fractions of solvent & solute respectively...... as benzene & toluene make an suited answer,vapour rigidity over d soln. is P(T) P(T)=PA+ PB

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