1. MONDAy… 12-5-16 Today.. Finish Friday’s test on UNIT 7 Thermodynamics
Get note sheet for Day one of Unit 8 Stoichiometry and complete it off of the weebly… do all math problems.
Check point of HP tomorrow!
HMWK: 1. Complete pg. 1 (1-10) and 1-5) and half of pg. 2 ( 6-10) of hmwk packet.

2. Tuesday…
Get out note guide from yesterday, reference table and calculator
WE need to discuss something again!!
We will start Unit 8 and then after new material.. You will have 30 minutes with HP group to do your check point
HMWK: Complete pg. 1 (1-10) and (1-5) and half of pg. 2 ( 6-10) of hmwk packet.
2. HP due this FRIDAY!!! 12/9/16

3. Unit 8
Stoichiometry

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

5. 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

6. Mole Conversions How many molecules are in 4 moles of H2 gas?
4moles x 6.02 x 1023 molecules
_________________ =
1 mole x Molecules
5 x 1027 atoms = _______________ moles
5 x atoms =x 1 mole = 8305 moles
_________
6.02 x atoms

7. Mole Conversions cont. 9.2 moles F2 = _______________ molecules
9.2 moles F2 x 6.02 x molecules
_____________
1 mole = 5.53 x molecules
How many atoms in the F2 molecules?
2 atoms in F2 x 5.53 x molecules = 1.10 x atoms
____________
1 atom

8. Mole Conversions cont. 3.4 moles C2H4 = ________ atoms
3.4 moles C2H4 x 6.02 x molecules x 6 atoms = 1.22 x atoms
1 mole 1 molecule of C2H4

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

10. 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.

11. 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

12. 171.346 g Molar Mass Find the molar mass of the following: MgBr2
Mg (24.31) + Br X2 (79.90) = g
Ba(OH)2 (Ba) + (O x2) +( Hx 2) g

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

14. 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 g

15. Mole/Gram Conversions
Convert the following:
How many grams are in 0.27 mol of Ba(OH)2
0.27moles x Ba ( OH) 2 weight = ( g)
_______________________ = g
1 mole