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29 July, 12:19

The vapor pressure of pure water at 30°C is 40 torr. If NaCl is dissolved into a sample of water until the total vapor pressure of the mixture at 30°C is 32 torr, what is the mole fraction of NaCl?

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  1. 29 July, 13:50
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    Mole fraction is 0.2

    Explanation:

    You have to apply the colligative property about vapour pressure which formula is:

    ΔP = P°. Xm

    Where ΔP = P° - P

    Pressure of vapour from pure solvent (P°) - Pressure of vapour from solution

    40 Torr - 32 Torr = 40 Torr. Xm

    8 Torr / 40 Torr = 0.2. > Xm
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