A solution of sodium chloride in water has a vapor pressure of 19.7 torr at 25°C. What is the mole fraction of
NaCl in this solution?
What would be the vapor pressure of this solution at 45°C? The vapor pressure of pure water is 23.8 torr at 25°C and 71.9 torr at 45°C.
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p = P°a Xa
19.7 = 23.8 Xa
Xa = 0.828 ( water mole fraction)
Xa + X(NaCl) = 1
X (NaCl) = 1 - 0.828 = 0.172
p = 71.9 x 0.828 = 59.5 torr
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