Question

1. How does the vapor pressure of a compound change with the temperature of the surrounding environment?

2. What is the mole fraction of each component if 10 mL ethyl acetate is dissolved in 50 mL toluene?

3. When hearing a 50:50 mixture of miscible liquid compounds whose boiling points are significantly different, what is the composition of the vapor above the liquid?

A. It is a 50:50 Mixture

B. It is a mixture enriched in the component that had the higher vapor pressure.

C. It is a mixture enriched in the component that had the lower vapor pressure.

D. There is no vapor pressure above the solution.

Answer 1

Ans 1:

The vapor pressure of a compound is the amount of pressure exerted by it's vapor at a given temperature , when the compound is placed in closed system.

SInce the temperature causes the mrlting or boiling of the compound , which causes its subsequent evaporation. The compound in its gas phase exerts pressure on the walls of the compound if more and more heat is given to the system . More the temperature , more will be the vapor pressue . At the boiling point of the compound , the vapor pressure becomes equal to the pressure of the surroundings.