In order to accurately study the effect that changes in pressure, temperature and moles have on volume, chemists will often run their experiments under Standard State conditions.
Concept #1: Understanding Standard State Conditions
Concept #2: Standard Molar Volume
At STP, 1 mole of any ideal gas will occupy exactly 22.4 Liters of volume inside a container.
Knowing the meaning of STP allows you to now further manipulate the Ideal Gas Law.
Concept #3: Combined Gas Law
Practice: What volume will 5.72 x 1025 atoms of argon gas occupy at STP?
Concept #4: Using the Ideal Gas Law to find density or molar mass
The Ideal Gas Law can be further manipulated into new equations. These new equations can help us find the density or molar mass of a gas.
When calculating the density of a gas it is essentially to also recall the formula of that gas in order to find the molar mass, M.
Practice: What is the density of chlorine gas at STP?
Remember that units for molar mass are grams of compound divided by the moles of that compound.
Practice: An unknown gas sample weighs 3.12 g. If it has a volume of 0.206 µL when the temperature is 45oC and the pressure is 957 torr. What is its molar mass?