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Part 1 (1 point)
had See Periodic Table ( See Hint
Raoult's law can be used to determine the molar mass of an unknown substance based on the vapor pressure of a solution. This problem
will walk you through the steps required.
A chemist wants to determine the molar mass of a naturally occurring substance isolated from spearmint. She adds 6.031 g of this
substance to 25.00 g of acetone (C3HO; molar mass 58.08 g/mol). The vapor pressure of the solution is determined to be 0.2414 atm at
25 C. If the vapor pressure of pure acetone at this temperature is 0.2630 atm, what is the mole fraction of the solvent in this solution?
Give your answer to four significant digits.
X solvent


Using your answer from Part 1, calculate the moles of solute present in the solution. Give your answer to three significant digits.
moles of solute =
Part 3 (1 point)
See Hint
Finally you can calculate the molar mass of the solute. Remember that 6.031 g of solute was added to 25.0 g of acetone, giving a
solution vapor pressure of 0.2414 atm.
Use the mass of solute and your answer to Part 2 to calculate the molar mass, giving your answer to three significant digits.
molar mass of solute =

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