Physical chemistry

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Estimate the vapor pressure of sea water at 20C given that the vapor pressure of pure water is 2.338 kPa at that temperature and the solute is largely Na+ and Cl- ions, each present in about .50 mol/dm^3.
I'm pretty sure the formula to use is pj=xjpj'. Where pj' is the vapor pressure of a pure substance, but I can't figure out how to solve for the mole fractions on the sodium and chlorine. Thanks

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    Kgololosego /physical chemistry

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    How many grams of sucrose Akerla (molar mass -342 g / mol) must be added to 450 grams of water (molar mass 18.0 g / mol) to change the vapor pressure to 745 mm Hg at 100

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