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An open flask sitting in a lab fridge looks empty, but we know that actually it is filled with a mixture of gases called air. If the flask volume is 0.00355 m3 and the air is at standard temperature and pressure, how many gas molecules does the flask contain?
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At STP 22.4 liters of any gas is equal to one mole of gas or 6.02 x 10^23 molecules. 1000 liters is equal to 1 cubic meter, so 0.00355 cubic meters is equal to 3.55 liters (that's a pretty big flask! it must be a really big refrigerator). So you've got 3.55 liters and 22.4 liters is one mole. The fraction of a mole you have is 3.55/22.4 = 0. 158 moles, and 0.158 x 6.02 x 10^23 = 9.51 x 10^22 molecules.