Question

A flask at room temperature contains exactly equal amounts (in moles) of nitrogen and xenon

•which of the two gases exerts the greater partial pressure?

•the molecules or atoms of which gas have the grater average velocity?

•the molecules of which gas have the greater average kinetic energy?

•If a small hole were opened in the flask, which gas Effuses more quickly?

Answer 1

A flask at room temperature contains exactly equal amounts (in moles) of nitrogen and xenon

•which of the two gases exerts the greater partial pressure?

Since the number of moles of two gases are same, their mole fractions will be same and their partial pressures will be equal. Hence, both gases exert equal partial pressure.

•the molecules or atoms of which gas have the grater average velocity?

Average velocity is inversely proportional to the square root of molar mass.

The molar masses of nitrogen and xenon are 28 g/mol and 131.3 g/mole.

Since molar mass of nitrogen is lower than the molar mass of xenon, nitrogen molecules will have higher average velocity.

•the molecules of which gas have the greater average kinetic energy?

The average kinetic energy is independent of the molar mass. Hence, both gases will have same average kinetic energy.

•If a small hole were opened in the flask, which gas Effuses more quickly?

The rate of effusion is inversely proportional to square root of molar mass. Nitrogen having small molar mass will effuse more quickly.