2. Miss Fogg Spring 2016

3.  A particle can refer to an individual atom OR a type of molecule ◦ Jellybean ◦ Baseball ◦ Carbon atoms ◦ Hydrogen atoms ◦ Water molecules ◦ Carbon dioxide molecules  Whatever the case, we often need to know the mass of an individual particle in the context of the problem to use the mole concept

4.  What is the mass of 1 mole of carbon? Molar mass tells you mass per mole of substance 12.01 g1 mol C = 12.01g

5.  What is the mass of 2.00 moles of magnesium? Molar mass tells you mass per mole of substance 24.305 g2.00 mol C 1 mol C = 48.6g (2)(24.305) = 48.61g

6. Calculate the formula mass of carbon dioxide, CO 2. 12.01 g + 2(16.00 g) = 44.01 g  One mole of CO 2 (6.02 x 10 23 molecules) has a mass of 44.01 grams

7.  What is the mass of 2.00 moles of water? Molar mass H 2 O = 2(1.01) + (16.00) = 18.02g/mol H 2 O 18.02 g H 2 O2.00 mol H 2 O 1 mol H 2 O = 36.0g (2.00)(18.02) = 36.04g

8. Using Avogadro’s Number  How many atoms are in 5.5 moles of atoms? 5.5 x (6.02 x 10 23 )= On your calculator… 5.5*(6.02E23)= 3.311E24 3.311 x 10 24 = 3.3 x 10 24 atoms

9. 5.5 mol = atoms 6.02 x 10 23 atoms 3.3 x 10 24 1 mol (5.5)(6.022 x 10 23 )  How many atoms are in 5.5 moles of atoms?

10. 4.6x10 24 atoms S = moles Sulfur 1 mol S 7.6 6.02x10 23 atoms S (4.6x10 24 )/(6.022 x 10 23 )  If we have 4.6x10 24 sulfur atoms, how many moles do we have?

11. 18.2 g Li = atoms Li 1 mol Li 6.02 x 10 23 atoms Li 1.58 x 10 24 6.94 g Li1 mol Li (18.2)(6.022 x 10 23 )/6.94  How many lithium atoms are in 18.2g of lithium?

12.  How many grams of lithium are in 3.50 moles of lithium? 3.50 mol Li = g Li 1 mol Li 6.94 g Li 24.3

13.  How many atoms of lithium are in 3.50 moles of lithium? 3.50 mol = atoms 1 mol 6.02 x 10 23 atoms 2.07 x 10 24

14. Equal volumes of all gases at the same temperature and pressure contain the same number of molecules. - Amedeo Avogadro Equal volumes of all gases at the same temperature and pressure contain the same number of molecules. - Amedeo Avogadro At STP (Standard Temperature and Pressure): 1 mole of a gas occupies 22.4 liters of volume At STP (Standard Temperature and Pressure): 1 mole of a gas occupies 22.4 liters of volume

15.  How many moles of hydrogen are in 100 L of hydrogen at STP? 100 L = mol 22.4 L 1 mol 4.64

16.  How many liters are occupied by 3 moles of oxygen gas at STP? 3 mol = L 1 mol 22.4 L 67.2

17. Mole Atoms or molecules Atoms or molecules Liters Grams 6.02 x 10 23 AtomicMassAtomicMass 22. 4 L 22.4 L

18.  Use the chart to convert between particles, moles, and volume