1. Unit 8
Stoichiometry

2. The Mole Mole (mol): SI unit for measuring the amount of a substance.
Avogadro’s Number: 6.02 x 1023

3. The Mole - examples 1 mole of Helium = 6.02 x 1023 atoms
1 mole of Oxygen = 6.02 x 1023 molecules O2
1 mole of H2O = 6.02 x 1023 molecules H2O

4. Mole Conversions How many molecules are in 4 moles of H2 gas?
2. 5 x 1027 atoms = _______________ moles

5. Mole Conversions cont. 9.2 moles F2 = _______________ molecules
2. How many atoms in the F2 molecules?

6. Mole Conversions cont.
3.4 moles C2H4 = ________ atoms

7. Mole Conversion practice cont.
0.45 mole He = ________atoms
x 1023 molecules CH4 = ________moles
moles H2O = __________ atoms

8. Molar Mass Molar Mass: The mass of one mole of an element or compound.
Molar mass of a compound = the sum of the masses of the atoms in the formula
Use the atomic masses in grams on the periodic table.

9. Molar Mass The molar mass of water - H2O
Mass of Hydrogen 2 x = 2.016
Mass of Oxygen = 16.00
Molar mass of water grams/mol

10. Molar Mass
Find the molar mass of the following:
MgBr2
Ba(OH)2

11. Molar Mass cont. Find the molar mass of the following compounds:
Ba3(PO4)2
C6H12O6

12. Mole/Gram conversions
Molar mass is grams per mol, so we can determine the number of grams in a given amount.
To convert from Moles to grams, multiply the moles by the molar mass to get grams.
Ex mol H2O = _______ g
.033 mol x g =
1 mol

13. Mole/Gram Conversions
Convert the following:
How many grams are in 0.27 mol of Ba(OH)2