1.  Molar Mass

2. \ Molar Mass  The mass of 1 mole of an element or compound  Units: g (grams)  Molar mass = atomic mass  Atomic mass of each element is in RED (units are amu)  Round to the nearest hundredth!!

3. For an Element  Take the element Carbon (C)  Molar mass = 12.01g  1 mol of C = 12.01g  How about Boron (B)?  Molar mass =

4. For a Compound  Take the compound NO  Molar mass of the compound = sum of the molar mass of each element  14.01 + 16.00 = 30.01g  1 mole of NO = 30.01g  How about CO 2  Molar mass =

5. What is the molar mass of: NaOHK 2 CrO 4 Mg 3 (PO 4 ) 2

6. Example 12 Calculate the mass in grams of 0.0450 moles of chromium (Cr).

7. Example 14 What is the mass of 2.50 moles of CH 4 ?

8. Example 16 Determine the number of moles in 35.5g of silver (Ag).

9. Example 18 Calculate the number of moles of 325g of Ca(OH) 2

10. Example 20 How many atoms are in 63.2g of beryllium (Be)?

11. Example 21 How many formula units (f.u.) are in 124g of mercury(II) chloride (HgCl 2 )?

12. Example 22 What is the mass in grams of 3.15x10 24 atoms of silver (Ag)?

13. Example 23 What is the mass in grams of 1.50x10 15 molecules of silver dioxide (SO 2 )?