# What are the mole fraction and the mole percent of oxygen in exhaled air if P (subscript of O2) is 116 torr and a P (subscript of total) is 788 torr? I not sure if the question makes sense.

##### 1 Answer

Mar 25, 2015

The mole fraction of oxygen in exhaled air is

You were given the total pressure of an air sample and the partial pressure of oxygen, which means that you can solve for the mole fraction of oxygen by using

In your case, you'll get

The mole percent is imply the mole fraction multiplied by 100, so

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