(DA) Nov. 22, 2010: Volume Conversion

• At a specific pressure and temperature one mole of any gas occupies the same volume
• At 0 Celsius and 101.3 kPa = 22.4 Litres.
• This temperature and pressure is called STP [(S)tandard (T)emperature and (P)ressure]
• 22.4 L mol is the molar volume of STP
  
  Example:

1. A container with a volume of 893 L contains how many moles of air is STP?
   893L x 1 mol = 39.9 mol
               22.4L

            Breakdown:
What you want to do is put write down 893L:

• 893L

After, figure out what the question asks for. If it asks for a mol, you need to cancel out the 
information (units) that you already have by multiplying your information with 1 mol divided by STP.

• 893L x 1 mol =
              22.4L
  After this, divide 893 by 22.4

• 893L x 1 mol = 39.8660714
             22.4L

This is not your final answer. You need to watch out for your significant digits.

• 893L x 1 mol = 40.0
              22.4L