Problem: A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 256 torr. Pure pentane and hexane have vapor pressures of 425  torr and 151 torr, respectively, at room temperature.What is the mole fraction of hexane? (Assume ideal behavior.)

FREE Expert Solution

Raoult's Law:

$\overline{){{\mathbf{P}}}_{{\mathbf{total}}}{\mathbf{=}}{{\mathbf{\chi }}}_{{\mathbf{pentane}}}{{\mathbf{P}}}_{{\mathbf{pentane}}}{\mathbf{+}}{{\mathbf{\chi }}}_{{\mathbf{hexane}}}{{\mathbf{P}}}_{{\mathbf{hexane}}}}$

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Problem Details

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 256 torr. Pure pentane and hexane have vapor pressures of 425  torr and 151 torr, respectively, at room temperature.

What is the mole fraction of hexane? (Assume ideal behavior.)