Gas Laws and Partial Pressures

This video tutorial explains Dalton's Law of Partial Pressure, which states that the total pressure of a gas mixture is the sum of the individual partial pressures of each gas. It covers methods to calculate partial pressures using the ideal gas law and mole fractions. The video includes example problems to demonstrate these calculations, focusing on gases like argon, oxygen, nitrogen, and carbon dioxide.

What does Dalton's Law of Partial Pressure state?

• The total temperature of a gas is equal to the sum of the individual partial temperatures.

• The total volume of a gas is equal to the sum of the individual partial volumes.

• The total mass of a gas is equal to the sum of the individual partial masses.

• The total pressure of a gas is equal to the sum of the individual partial pressures.

In the ideal gas law equation PV = nRT, what does 'n' represent?

• Moles of gas

• Pressure

• Temperature

• Volume

How can you calculate the partial pressure of a gas if you know the mole fraction?

• Add the mole fraction to the total pressure.

• Multiply the mole fraction by the total pressure.

• Subtract the mole fraction from the total pressure.

• Divide the mole fraction by the total pressure.

What is the mole fraction of a gas if it constitutes 40% of the total gas molecules?

• 0.004

• 4.0

• 0.04

• 0.4

If a storage tank contains 2 moles of argon, 3 moles of O2, and 5 moles of N2, what is the mole fraction of argon?

• 0.2

• 0.1

• 0.3

• 0.5

Given a total pressure of 1000 torr, what is the partial pressure of a gas with a mole fraction of 0.3?

• 300 torr

• 200 torr

• 500 torr

• 100 torr

Using the ideal gas law, what is the partial pressure of N2 if you have 2 moles of N2 in a 2-liter container at 300 K?

• 24.6 atm

• 12.3 atm

• 36.9 atm

• 61.5 atm

What is the total pressure if you have partial pressures of 24.6 atm and 36.9 atm?

• 30.0 atm

• 61.5 atm

• 50.0 atm

• 70.0 atm

If the total pressure is 825 torr and the partial pressures of N2 and O2 are 600 torr and 150 torr respectively, what is the partial pressure of CO2?

• 75 torr

• 25 torr

• 50 torr

• 100 torr

What is the mole fraction of CO2 if its partial pressure is 75 torr and the total pressure is 825 torr?

• 0.150

• 0.075

• 0.091

• 0.200