At 85°c, the vapor pressure of a is 566 torr and that of b is 250 torr. calculate the composition of a mixture of a and b that boils at 85°c when the pressure is 0.60 atm. also, calculate the composition of the vapor mixture. assume ideal behavior.

Composition of the mixture:

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Composition of the vapor mixture:

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Explanation:

If the ideal solution model is assumed, and the vapor phase is modeled as an ideal gas, the vapor pressure of a binary mixture with and molar fractions can be calculated as:

Where and are the vapor pressures of the pure compounds. A substance boils when its vapor pressure is equal to the pressure under it is; so it boils when . When the pressure is 0.60 atm, the vapor pressure has to be the same if the mixture is boiling, so:

With the same assumptions, the vapor mixture may obey to the equation:

, where P is the total pressure and y is the fraction in the vapor phase, so:

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The fractions of B can be calculated according to the fact that the sum of the molar fractions is equal to 1.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.