*Mole Fraction (X)** relates the moles of solute and solvent within a solution:*

$\overline{){\mathbf{m}}{\mathbf{o}}{\mathbf{l}}{\mathbf{e}}{\mathbf{}}{\mathbf{f}}{\mathbf{r}}{\mathbf{a}}{\mathbf{c}}{\mathbf{t}}{\mathbf{i}}{\mathbf{o}}{\mathbf{n}}{\mathbf{}}{\mathbf{\left(}}{\mathbf{X}}{\mathbf{\right)}}{\mathbf{=}}\frac{\mathbf{m}\mathbf{o}\mathbf{l}\mathbf{e}\mathbf{}\mathbf{o}\mathbf{f}\mathbf{}\mathbf{s}\mathbf{o}\mathbf{l}\mathbf{u}\mathbf{t}\mathbf{e}}{\mathbf{m}\mathbf{o}\mathbf{l}\mathbf{e}\mathbf{}\mathbf{o}\mathbf{f}\mathbf{}\mathbf{s}\mathbf{o}\mathbf{l}\mathbf{u}\mathbf{t}\mathbf{i}\mathbf{o}\mathbf{n}}}$

**Assume the total mass is 100 g, so each would have to weigh 50 g.**

**molar mass ethanol****C**_{2}H_{5}O**H ****2 C x ****12.01 g/mol N = 24.02 g/mol**** ****6 H x ****1.01 g/mol H = 6.06 g/mol**

Total:

At 63.5˚C the vapor pressure of H_{2}O is 175 torr, and that of ethanol (C_{2}H_{5}OH) is 400 torr. A solution is made by mixing equal masses of H_{2}O and C_{2}H_{5}OH. What is the mole fraction of ethanol in the solution?

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