1. Molar mass Mass of 1 mole of substance Can be gam, gmm, or gfm

2. What is mass in g of 1.72 mol CaCl2? 1 mol CaCl 2 1 Ca atm 40.1 g 2 Cl atm 2(35.5)= 71.0g 111.1g 1.72 mol111.1g = 1 1 mol 191g (191.092)

3. Calculate the mass in g for 0.250 mol Potassium permanganate. 1 mol KMnO 4 1 K39.1g 1 Mn54.9g 4 O 4(16.0)64.0g 158.0g 0.250 mol158.0g 11 mol = 39.5g

4. Volume Volume of mole of liquid or solid can vary. Mole of glucose is much larger than mole of water. Volume of mole of gas is different.

5. Volume of gas varies with temperature and pressure. Measure volume of gas at STP. Standard Temperature = 0° C Standard Pressure = 1 atmosphere = 101.3 kPa

6. At STP 1 mole of any gas occupies 22.4 L This is about the volume of 11 x 2-liter soda bottles. 22.4 L is known as the molar volume. 22.4 L of gas @ STP = 1 mole = 6.02 x 10 23 particles The mass of 1 mole of gas @ STP(22.4 L) varies with the molar mass of the gas.

7. Determine the volume of 2.74 mol He @STP. 2.74 mol 22.4 L = 11 mol 61.376 L = 61.4 L

8. Calculate the volume of 7.6 mol Ar @ STP. 7.6 mol22.4 L= 11 mol 170. 24 L = 170 L

9. Calculate the volume of 0.44 mol C 2 H 6 @ STP. 0.44 mol 22.4 L= 11 mol 9.856 L = 9.9 L

10. Determine the molar mass of a gas that has a density of 0.179 g / L @STP. 0.179g22.4 L = L1 mol 4.0096 g/mol = 4.01 g/mol

11. What is the density of Ne @STP? D= M/V= 20.2 g/22.4 L = 0.901785 g/ L = 0.902 g/L

12. What is the density of NO 2 @STP? 1N14.0g 2O2(16.0g)32.0g 46.0g D= M/V = 46.0g / 22.4 L = 2.05357 g/L = 2.05 g/L

13. We can now convert between mass, volume, and particles.