1. 10.5 NOTES Avogadro Molar Volumes

2. B. Avogadro’s Principle - equal volumes of same temp and pressure contain equal #’s of particles
- 1 mole contains x 1023 particles
- equal #’s of particles have same volume, but not necessarily same mass 
1 mol of STP = 22.4 L = 6.02 x 1023 molecules = 2.02 g
1 mole of STP = 22.4 L = 6.02 x 1023 molecules = 28.0 g
Molar volume = 22.4 L at STP One mole of a gas occupies 22.4L at STP (0.00°C and 1.00 atm)

4. Determine the volume of 0.881 mol of a gas at STP.
V = mol x 22.4 L
1 mol = 19.7 L

5. Find V, given 2.00kg CH4 at STP. 1 kg 16.0g 1 mol = 2.80 x 103 L
kg x 1000g x 1 mol x L
1 kg g 1 mol = 2.80 x 103 L

6. How many moles are in a 2.50 L?
Moles = 2.50 L x 1 mol
22.4 L = mol

7. What is the density of hydrogen sulfide at STP?
H2S = 34.1 g x 1 mol
1 mol L = 1.52 g/L

8. A sample of gas has a mass of 3
A sample of gas has a mass of 3.89 grams and occupies a volume of 450 mL at STP. What is the molar mass of the gas?
MM = 3.89 g x L
.450 L mol = 194 g/mol