1. Calculating Molar Mass

2. What Substance am I activity?
Agenda
Info
What is Molar Mass??
Molar Mass Practice
What Substance am I activity?

3. You Will Need…
Periodic Table
Calculator
Note Sheet

4. Determining How Much we Have of Something
Last Class
Understood how many particles are in 1 mole of a substance
Today
Calculate how many grams of a substance we have in 1 mole
AKA: Molar Mass

5. Molar Mass The number of grams in 1 mole of a substance Units: g/mol
Physical property
Molar masses are always never measured directly. They may be calculated from standard Atomic Masses found on your Periodic Table

6. Mole and Atomic Mass Connection
A mole is defined as the number of carbon atoms in exactly 12.0 grams of carbon-12
1 mole of carbon = 6.02 x 1023 carbon atoms = grams of carbon
Use one decimal place
1 mole = 6.02 x 1023 particles = Molar Mass (g)

7. Molar Mass For our purposes, AKA…
Formula weight, molecular weight, gram molecular weight, gram formula mass, and atomic weight
Each term comes with a different unit
WE are going to use them interchangeably

9. Molar Mass of Compounds
The molar mass of compounds is the molar mass of the atoms multiplied by the number of atoms in the compound.

10. Example
What is the molar mass of water?

11. Molar Mass of Hydrates
An ionic salt containing water molecules combined in a definite ratio as an integral part of the crystal
Notation: hydrous compound . nH2O
Copper sulfate pentahydrate
CuSO4 . 5H2O

12. Example
What is the molar mass of CuSO4 . 5H2O?

13. Let me know when you are done for answer sheet! 
Practice on Your Own! 
Let me know when you are done for answer sheet! 

14. What Substance Am I Activity?
You are in big trouble! You have an important restaurant reviewer coming to your restaurant tonight but someone has taken off all the labels from your bottles! How will you know which one is for your delectable dishes and which bottles contain substances the reviewer will probably find hazardous?

15. Task There are 6 bottles with the label removed.
Each contains one mole of an unknown substance.
Using only an electronic balance and your periodic table, determine what each substance is.

16. Clues Four of the six are elements, 2 are compounds.
The compounds are in bottles are either NaCl, FeS, CaCO3, SiO2, or C6H12O6
The mass of the each bottle is written on the bottle.
Bottles 1, 2, 4, and 6 have elements

17. Task
Solve the Molar Masses
Weigh the different bottles (in each group)
Complete back for mole/molecule problems
TURN INTO BIN!!!!