The normal boiling point of methanol is 64.7°c. a solution containing a nonvolatile solute dissolved in methanol has a vapor pressure of 649.2 torr at 64.7°c. what is the mole fraction of methanol in this solution?

The mole fraction of methanol in the solution of methanol is 0.8542

HOW TO CALCULATE MOLE FRACTION:The mole fraction of a solvent can be calculated using Raoult's law equation as follows:

P = Χ × P⁰

Where,

P = vapour pressure of the solutionΧ = mole fraction of the solventP⁰ = vapour pressure of the pure solventAccording to this question, a solution containing a nonvolatile solute dissolved in methanol has a vapor pressure of 649.2 torr at 64.7°C.

X = P/P⁰

X = 649.2torr/760torr

X = 0.8521

Therefore, the mole fraction of methanol in the solution of methanol is 0.8542.

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A. volume stays constant. just took took the quiz

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.