The vapor pressure of water at 32 degrees C is 4.76 kPa. A glass of water in sea

Question

The vapor pressure of water at 32 degrees C is 4.76 kPa. A glass of water in sealed in a a 1.00L container filled with air at 32 degree C. After the water comes to equilibrium with the air in the container, the total pressure is 1 bar and there is 500 g of liquid water in the glass.

a. What will be the partial pressure of water vapor in the container?

b. If 35.0 g of ethylene glycol is dissolved in the water, will the vapor pressure increase or decrease?

c. If 35.0 g of ethylene glycol is dissolved in the water, will the mass of liquid water be decreased or increased?

d. Calculate change in the mass of the liquid water after it has returned to equilibrium.

Explanation / Answer

we know that water in the glass = 500 g

therefore mole fraction = 0.5

hence the partial pressure = mole fraction * Vapour pressure

= 0.5 * 4.76 kPa = 2.38 kPa

b. vapor presuure of the water will not be affected by the addition of ethylene glycol as vapour presuure depends only on the temperature.

c. the mass of the liquid will be lesser than the sum of the masses of the ethylene glycol and water

d. the mass of the liquid water in the glass = 500g

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