Which best defines partial pressure in a mixture of gases?
pressure that is exerted by all the gases of a mixture on the container
pressure that is exerted by one gas as if it occupied a container by itself
half of the pressure that is exerted by the gases of a mixture on the container
sum of the individual pressures that are exerted by two or more gases

pressure that is exerted by one gas as if it occupied a container by itself

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Pressure that is exerted by one gas as if it occupied a container by itself.

Explanation:

Imagine a container that holds only oxygen and hydrogen gas at a given temperature, that would be a mixture of gases. The partial pressure of hydrogen would be the pressure that would remain in said container if the container if we remove all of the oxygen gas without changing the temperature.

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