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Surface Tension

A 1 : 2 mixtu...

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A 1 : 2 mixture (by mole) of ethanol and propanol exerts a vapour pressure of 250 mm Hg. The vapour pressure of propanol in solution is 200 mm Hg, then the vapour pressure of pure ethanol is (in mm Hg)

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Q. A mixture of ethanol and propanol has vapor pressure 279 mm of Hg at 300 K. The mol fraction of ethanol in the solution is 0.6 and vapour pressure of pure propanol is 210 mm of Hg. Vapour pressure of pure ethanol will be:

Q. A solution of 1-propanol and 2-propanol having

\frac{3}{4}

by mass of 2-propanol has an equilibrium vapour pressure of 88.8 mm Hg. Another solution having

\frac{1}{3}

by mass of 2.propanol has an equilibrium vapour pressure of 68.3 mm Hg. Calculate vapour pressure of pure alcohols at

40^{o} C

assuming ideal solution mixture prepared at

40^{o} C

.

55^{0} C

, ethanol has a vapour pressure of

168

mm Hg, and the vapour pressure of methylcyclohexane is

280

mm Hg. A solution of the two in which the mole fraction of ethanol is

0.68

, has a total vapour pressure of

225

mm Hg. This solution is formed from its components with:

Q. Cyclohexane and ethanol at a particular temperature have vapour pressures of

280 m m H g

168 m m H g

respectively. If the mole fraction of cyclohexane in the solution mixture is 0.32, the mixture is found to have a total vapour pressure of

250 m m H g

.

Choose the correct statement(s).

Q. At a particular temperature, the vapour pressures of 'A' and 'B' are

250 m m H g

180 m m H g

respectively. If the mole fraction of 'B' in the solution mixture is 0.42, the total vapour pressure of the solution mixture is

200 m m H g

.
Choose the correct statement.

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