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A nonvolatile solute is dissolved in benzene and the resulting solution has a vapor pressure of 18. 5 torr. What is the mole fraction of the solute? (p° of benzene is 26. 5 torr).

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Ogorwyneidn

The mole fraction of the solute is given as 0.3019

The vapor pressure of the volatile solvent

The formula for the vapor pressure of the volatile solvent is given as

P = NP°

Using Raoult's law

N is defined to be the mole fraction

Po is the vapor pressure.

From P =  NP°

N = P/P°

N = 18.5/26.5

N = 0.6981

The  mole fraction

1-  0.6981

= 0.3019

The mole fraction of the solute is given as  0.3019

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