Answer to Question #67397 in General Chemistry for kelsey sederquest

Question

An 0.9% (w/v) solution of salt in water has a density of 1.080 g/mL.
a. Determine the mole fraction of the salt in water (the formula is NaCl).
b. Determine the mole fraction of the water in this same solution.
c. Use Raoult’s Law to predict the vapor pressure of water above this solution at 25oC. The vapor pressure of pure water at this temperature is 23.8 torr. Salt is nonvolatile.
d. What is the molality of the salt in the water?
e. Predict the boiling point of this solution at 760 torr.
f. What is the freezing point of this solution?
g. Finally, what is the osmotic pressure of this solution at 25oC?

Answer 1

a) 0.16 M
b) 59 M
c) 23.7 torr
d) 0.15 mol/kg
e) 100,156 С
f) -0,543 С
g) 74 Pa