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22 May, 02:20

A solution is prepared by mixing 3.44 mol of acetone with 1.45 mol of cyclohexane at 30°c. calculate the χacetone and χcyclohexane in the vapor above the solution. p°acetone = 229.5 torr and p°cyclohexane = 97.6 torr.

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  1. 22 May, 04:07
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    First calculate the mole fraction of each substance:

    acetone: 3.44 mol : (3.44 mol + 1.45 mol) = 0.703

    cyclohexane: 1.45 : (3.44 mol + 1.45 mol) = 0.297

    Raoult's Law: P (total) = P (acetone) · χ (acetone) + P (cyclohexane) · χ (cyclohexane)

    P (total) = 229.5 torr · 0.703 + 97.6 torr · 0.297

    P (total) = 190.3 torr

    χ for acetone: 229.5 torr · 0.703 : 190.3 torr =.848

    χ for cyclohexane: 97.6 torr · 0.297 : 190.3 torr =.152
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