A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 255 torrtorr. Pure pentane and hexane have vapor pressures of 425 torrtorr and 151 torrtorr, respectively, at room temperature. What is the mole fraction of hexane?

Question

Chemistry

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1 May, 13:01

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 255 torrtorr. Pure pentane and hexane have vapor pressures of 425 torrtorr and 151 torrtorr, respectively, at room temperature. What is the mole fraction of hexane?

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Answers (1)

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Alyson Calhoun · Answer 1

The mole fraction of hexane is 0.6204

Explanation:

Obs: X hex = 1 - X pen

Ptot = P pen + P hex

Ptot = X pen P pen + X hex P hex - --> applying X hex = 1 - X pen

X pen = (Ptot - P hex) / (P pen - P hex)

X pen = (255 - 151) / (425 - 151) = 0.3795

X hex = 1 - X pen

X hex = 1 - 0.3795 = 0.6204