• Mole fraction is a useful quantity for analyzing gas mixtures in conjunction with Dalton’s law of partial pressures.
  • The partial pressure of a gas in a mixture is equal to its mole fraction multiplied by the total pressure.
  • Use of the mole fraction allows calculation to be made for mixtures of gases.
  • Use the resource below to answer the questions that follow the answers to the questions in the previous section.
  • The answers to these questions can be found at the bottom of the page.
  • The questions are: What is mole percent?
  • Do the mole fractions add up to 1.00?
  • How do you determine partial pressure?
Select from the frequently asked questions below