Converting Between Moles and Liters of a Gas at STP

To convert between moles and the volume of a gas at STP, we will use the factor label method discussed in the first unit.

This conversions relies on the fact that a mole of gas at STP has a volume of 22.4 L. It is important to note, however, that if the conditions of the gas are different this conversion will NOT work. Under those conditions you must use the ideal gas law to convert between moles and liters.

Let's try some problems

What is the volume of a balloon that holds 1.78 moles of oxygen gas at STP?









How many moles of helium at STP will fit into a 39.6 L container?

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