2. 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

3. 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?

4. Lecture 3.5 – 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 mass of 6.02 x 10 23 particles of a substance) The molar mass is 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! ElementNumber of Atoms in Compound Molar MassTotal Element Molar Mass Total Molar Mass x x x = = =

10. Class Examples CaBr 2 Ca 3 (PO 4 ) 2

11. Table Talk Calculate the molar mass for the following compounds: – KCN – Ca(NO 3 ) 2 – Al 2 (SO 4 ) 3

12. 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: 7498g/mol75 122Molar Massg56 37Atomic Massmol97 369955123

13. 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 H 2 SO 4 5. Calculate the molar mass for Ca(OH) 2 6. Calculate the molar mass for AlPO 4 7. Calculate the molar mass for HCl 8. Calculate the molar mass for MgO 2

14. How many moles of chalk does it take to write your name?

15. How do we convert between moles and grams?

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

17. I. Converting from Grams to Moles & Back It is possible to convert between grams and moles of a substance. We accomplish this conversion using the same tools of dimensional analysis

18. II. OUR CONVERSION FACTOR FOR GOING BETWEEN GRAMS AND MOLES…

19. III. Using the Conversion Factor When converting from grams to moles you must DIVIDE by the molar mass When converting from moles to grams you must MULTIPLY by the molar mass Grams 1 mole Molar Mass Moles Molar Mass 1 mol Grams

20. Class Example If you react 360 g of C 6 H 12 O 6 how many moles of C 6 H 12 O 6 did you react in this reaction?

21. Table Talk If you start with 36 g of H 2 O, then how many moles of H 2 O do you react?

22. Class Example If we place 15 moles of NaN 3 how many grams of NaN 3 do you have before the reaction?

23. Class Example If we place 26 moles of MgCl 2 how many grams of MgCl 2 do you have before the reaction?

24. Coach and Correct Pair up with the person across from you. Pick a person to be Partner A and a person to be Partner B. For the first question Partner A is the coach and Partner B is the writer.

25. Question 1 You react 7 moles of HCl how many grams of HCl do you have?

26. Question 2 You have 4 moles of CS 2 how many grams of CS 2 do you have?

27. Question 3 You have 500 g of NH 3. How many moles of NH 3 do you have?

28. Question 4 You start with 7 moles of KClO 3, how many grams did you begin the reaction with?

29. Question 5 You have 52 g of N 2 how many moles N 2 will you have

31. Closing Time Homework 3.5