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ZingPath: Gas Laws

Partial Pressure

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Partial Pressure


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You will explore the relationship between partial pressure and the total pressure of gas mixtures.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Define partial pressure as the pressure a single gas contributes to the total pressure in a mixture.
  • Explain that the total pressure of a mixed sample of gas is equal to the sum of the partial pressures of all of the gases.
  • Explain that the individual gases in a mixture do not affect each other’s pressure, so long as they are not reacting with each other.
  • Calculate the total pressure of a mixture of gases using their partial pressures.

Everything You'll Have Covered

Dalton's Law of Partial Pressures accounts for each individual gas pressure present when a mixture of gases is present. Within a mixture of gases are different atoms. These atoms have varying masses, so their kinetic energy also is different. With different energy, each atom applies a different pressure. Dalton's Law of Partial Pressures states that the sum of individual pressures equals the total gas pressure of a sample. It can be written as

Tutorial Details

Approximate Time 20 Minutes
Pre-requisite Concepts Learners should know how the amount of moles will affect pressure and volume according to the Ideal Gas Law.
Course Chemistry
Type of Tutorial Experiment
Key Vocabulary barometer, Dalton, experiment