Partial Pressures

In a mixture of ideal gases, the pressure of each individual gas can be calculated as the mole fraction of the gas in the mixture multiplied by the total pressure:

Partial Pressure = Mole Fraction * Total Pressure

Example: If 1 mole of  Oxygen and 4 moles of Nitrogen are in a container, and the total pressure is 10 Pa, what is the partial pressure of Oxygen

Mole Fraction of Oxygen =                           1 mole of Oxygen_                                                                                                          1 mole of Oxygen + 4 moles of Nitrogen

Mole Fraction of Oxygen = 0.2

Partial Pressure = Mole Fraction * Total Pressure

Partial Pressure = 0.2 * 10 Pa

Partial Pressure = 2 Pa

 

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