An open flask sitting in a lab fridge looks empty, but it is filled with a mixture of gases called air. If the flask volume is 2.50 L, and the air is at standard temperature and pressure, how many gaseous molecules does the flask contain?
If we assume that the temperature inside the fridge is
From the Ideal Gas Law:
And thus we mulitply
If the flask were at room temperature, would it contain the same number of molecules?