1. End Catalyst 1. How many particles are in one mole?
2. How many hours are there in 362 minutes
3. How many minutes are in 2 years?
(1 year = 365 days; 1 day=24 h; 1 h=60 min)
End

2. Puppies!
You have 5 white dogs that weigh 15 pounds, 3 brown dogs that weigh 10 pounds, and 1 black dog that weighs 20 pounds. How much do all the dogs weigh together?

3. Rate Yourself!
Using your exit ticket score, rate yourself 1 – 4 on LT

4. Lecture 3.3 – Molar Mass and Gram to Moles Conversion

5. Today’s Learning Targets
LT 3.7 – I can calculate the molar mass of given element or compound.
LT 3.8 – Given an element, I can convert between the number of moles to grams and grams back to moles

6. What is molar mass?

7. I. Molar Mass
Molar mass is the mass, in grams, of 1 mole of substance.
The molar mass is equal to the mass listed on the periodic table
Units of Molar mass are g/mol
Molar Mass

8. How do we calculate molar mass?

9. More Tables! = = = x x x Element Number of Atoms in Compound
Molar Mass
Total Element Molar Mass
Total Molar Mass x = x = x =

10. Class Examples Ca
Br2
Ca3(PO4)2

11. Table Talk KCN Ca(NO3)2 Al2(SO4)3
Calculate the molar mass for the following compounds:
KCN
Ca(NO3)2
Al2(SO4)3

12. How do we convert between moles and grams?

13. Our Focus for Today Grams of Substance A Moles A Grams of A
How do we go from grams to moles?
Grams of A

14. I. Converting from Grams to Moles & Back
It is possible to easily convert between grams and moles of a substance.
We accomplish this conversion using the same tools of dimensional analysis we talked about last week.

15. II. OUR CONVERSION FACTOR FOR GOING BETWEEN GRAMS AND MOLES…
Molar Mass

16. III. Using the Conversion Factor
When converting from grams to moles you must DIVIDE by the molar mass
Grams
Grams
Moles
Moles
When converting from moles to grams you must MULTIPLY by the molar mass
Grams
Moles
Grams
Moles

17. Class Example
If you react 360 g of C6H12O6 how many moles of C6H12O6 did you react in this reaction?

18. Table Talk
If you start with 36 g of H2O, then how many moles of H2O do you react?

19. Class Example
If we place 15 moles of NaN3 how many grams of NaN3 do you have before the reaction?

20. Let’s Go Big Time!
If we place 26 moles of MgCl2 how many grams of MgCl2 do you have before the reaction?

21. BINGO
Take out a sheet of paper and make a 4 x 4 grid by folding the paper in half 4 times.
Write the following terms/numbers on the sheet: 74 98
g/mol 75
122
Molar Mass g 56 37
Atomic Mass
mol 97 36 99 55
123

22. Questions
1. The mass, in grams, of 1 mole of substance 2. This is the molar mass for an element on the Periodic Table 3. This is the units for molar mass 4. Calculate the molar mass for H2SO4 5. Calculate the molar mass for Ca(OH)2 6. Calculate the molar mass for AlPO4 7. Calculate the molar mass for HCl 8. Calculate the molar mass for MgO2

23. Moles of Chalk Collaborative Assignment
Some people might ask: “What do moles have to do with me?” This lab shows you!