1. Warm-Up- start a new sheet!
Read this: A counting unit is a unit that we use to name specific quantities of items. For example, if you want to say you have 12 eggs, what is another way of phrasing that?
Write this: Using that information, write down as many examples of counting units as you can think of. Whoever writes the most gets a prize!
No, you don’t need anything in the Prompt box today!

2. The Mole

3. The Mole A counting unit for atoms and molecules!
1 mole = x items
SI base unit for amount
Symbol = mol

4. Amedeo Avogadro
Italian scientist who determined that at a given temperature, every gas will have the same number of particles per unit volume
NA = x 1023

5. Who Cares?
1 mole of a gas will have a volume of 22.4 L at STP (0 oC and 1 atm).
1 mole of a substance will have a mass in grams equal to the average atomic mass given on the periodic table.

6. Calculating Molar Mass
To carry out a chemical reaction, you need 1 mole of zinc nitrate, Zn(NO3)2. How many grams will you need to get for this reaction?

7. Molar Mass Practice
Calculate the molar mass of these three substances:
H2O
NaHCO3
(NH4)3PO4

8. Hydrates
An ionic compound that has water incorporated into its structure is called a hydrate.
Examples:
MgCl2· 6 H2O
CuCl2· 2 H2O
CoCl2 (anhydrous)
CoCl2 · 6 H2O (hydrate)

9. Hydrate Molar Mass
You need 1 mole of copper (II) chloride to perform a reaction, but you only have its dihydrate in your stock room. How many grams should you collect for this reaction?

10. It’s Baaaaack……..
If we know any of the quantities of a substance in the picture, we can convert to any of the others.
Particles to moles
Moles to volume (for a gas)
Particles to mass
Take a guess at what method we use to do this…

12. Dimensional Analysis
A small container of compressed gas contains 4.70 moles of Helium. What volume will this gas occupy at STP?

13. Dimensional Analysis
I have 0.50 moles of Cu(NO3)2. How many grams do I have?

14. Dimensional Analysis
How many moles is x 1024 molecules of sugar?

15. Dimensional Analysis
How many grams are in 38.8 L of hydrogen gas at STP?