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Calculate the vapor pressure at 25 degrees C of an aqueous solution that is 5.70 %NaCl by mass.?

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Calculate the vapor pressure at 25 degrees C of an aqueous solution that is 5.70 %NaCl by mass. (answer in torr)

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  1. vapor pressure of water at 25 deg C = 23.756 torr

    100 g H2O+NaCl-

    5.70 g NaCl + 94.30 g H2O

    5.70 g NaCl = 0.09752 mol

    94.30 g H2O = 5.23447 mol

    H2O mole fraction = 5.23447 / 5.33199 = 0.9817

    vapor pressure of solution = 0.9817 x 23.756 = 23.322 torr

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