Adrianna C.

asked • 01/23/18

How do I calculate the mole fraction of methanol?

The normal boiling point of methanol is 64.7°C. A solution  containing a nonvolatile solute dissolved in methanol has a vapor pressure of 710.0 torr at 64.7°C. What is the mole fraction of the methanol in this solution?

Myrobostation R.

The mole fraction of any component of a solution is the number of moles of that component divided by the total number of moles of solute and solvent. The symbol of mole fraction is X.

The mole fraction does not distinguish the solute from the solvent. For any solution, we can calculate the mole fraction of each compound in the mixture.

Mole Fraction Calculator calculates the mole fraction of each compound in the mixture and it does not distinguish the solute from the solvent.
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01/29/18

1 Expert Answer

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Randall K. answered • 01/23/18

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Hello Adrianna, this is a Raoult's law problem which states
 
P soln. = X solvent * P^o solvent, where X solvent=mole fraction of the solvent and P^o=vapor pressure of the solvent
 
Rearranging we have X solvent = P soln./P^o solvent
 
The P soln. is given as 710.0 torr, now you need the vapor pressure of the solvent which is not given.  Look it up and solve.  The answer should be ~0.873.
 
 
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John W.

Thank you that really helped
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01/23/18

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