A solution containing ethyl alcohol and propyl alcohol has a vapour pressure of \( 290 \mathrm{~...

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A solution containing ethyl alcohol and propyl alcohol has a vapour pressure of \( 290 \mathrm{~mm} \) at \( 30^{\circ} \mathrm{C} \). Find the vapour pressure of pure ethyl alcohol if its mole fraction in the solution is \( 0 \cdot 65 \). The vapour pressure of propyl alcohol is \( 210 \mathrm{~mm} \) at the same temperature.
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