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What is the vapor pressure at 23 ¢ªC of a solution of 1.20 g of naphthalene, C10H8, in 25.6 g of benzene, C6H6? The vapor pressure of pure benzene at 23 ¢ªC is 86.0 mmHg; the vapor pressure of naphthalene can be neglected. Calculate the vapor pressure lowering of the solution.

  • chemistry -

    mols naphthalene = grams/molar mass
    mols benzene = grams/molar mass
    Xnaph = nnaph/total mols
    Xbenzene = nbenzene/total mols
    pbenzene = Xbenzene*Pobenzene

    plowering = Xnaph*Pobenzene

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