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We have to calculate the mole fraction of chloroform in the vapor above solution.

The mole fraction of a component in the vapors above the solution is calculated using this formula:

$\overline{){{\mathbf{X}}}_{{\mathbf{a}}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{{\mathbf{P}}_{\mathbf{a}}}{{\mathbf{P}}_{\mathbf{t}}}}$

**Where,**

X_{a} = mole fraction of a component in vapors above solution

P_{a} = vapor pressure of a component of solution

P_{t} = total vapor pressure

The vapor pressure of carbon tetrachloride, CCl_{4}, is 0.354 atm and the vapor pressure of chloroform, CHCl_{3}, is 0.526 atm at 316 K. A solution is prepared from equal masses of these two compounds at this temperature.

Calculate the mole fraction of the chloroform in the vapor above the solution.