One component of an ideal binary solution has a pure component vapor pressure equal to one-fourth the total pressure of the vapor mixture. The component constitutes 20 mole % of liquid phase. What is its mole fraction in the vapor phase?
Using Raoult's law and Dalton law
"x_i=\\frac{y_i\\>p_{TOTAL}}{p_i^*}"
Where "x_i=" Mole fraction of "i" component in solution
"y_i=" Mole fraction of component "i" in gas phase
"p_{TOTAL}=" Total vapor pressure
"p_i^*=" Equilibrium vapor pressure of the pure component "i"
"\\frac{20}{100}=\\frac{y_i\\>p_{TOTAL}}{\\frac{1}{4}\\>p_{TOTAL}}"
"y_i=\\frac{1}{4}\u00d7\\frac{1}{5}"
"=\\frac{1}{20}"
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