Chemical Forums
Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: sugarhillave on February 07, 2005, 07:10:40 AM
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in a soultion of sodium chloride in water, the vapor pressure is 19.6 torr at 25 degrees C.
i converted the pressure to 298.15 K and the temperature to .0258 atm.
i need to find out the mole fraction of NaCl, but i dont understand how to get either grams of moles.
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Use Raoult's law
P(soution) = X(water) x P(water)
P(solution) = 19.6 torr
P(water) at 25C needs to be provided from some source.
Then calculate X(water) = mole fraction water.
From that calculate mole fractions NaCl. Remember, sum of all fractions = 1.