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A solution contains 0.115 mol
and an unknown number of moles of sodium ch lo ride. The vapor pressure of the solution at
is 25.7 torr. The vapor pressure of pure water at this temperature is 31.8 torr. Calculate the number of grams of sodium chloride in the solution. (Hint: Remember that sodium chloride is a strong electrolyte.)
The number of moles of water is
The vapor pressure of the sodium chloride solution at is
The vapor pressure of pure water is
Let us calculate the mass of sodium chloride in the solution.
First, we have to find the mole fraction of water.
Now, we can calculate the number of moles of .
- Since is strong electrolyte, it is completely ionized to form 2 of dissolved particles. Therefore
The vapor pressure of the mixture and pure water is given. Use the Raoult's Law to find the mole fraction of water in the solution (with more ration, mixture partial pressure and pure solution partial pressure ):
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