1. Molar Mass of ionic compounds

2. Molar Mass
Molar mass- same as atomic mass but for a compound rather than an atom.
To determine the molar mass of any compound you add up the atomic mass of all atoms present.
NaCl
= g/mol (amu)

3. Molar mass with subscript numbers
Subscript numbers mean there are that many of that atom.
CaI2 =
or you can multiply
x 2 =
= g/mol (amu)

4. Molar Mass with parentheses
Parentheses and a subscript number mean there are that many of everything in the parentheses
Be(OH)2
( ) x 2 =
(17.008) x 2 =
= g/mol

5. Combining all of them (NH4)2CO3
( x 4) x x 3
( ) x
(18.042) x
= g/mol

6. Converting between moles and grams using molar mass

7. Converting between moles and grams
molar mass is the conversion factor
that many grams equal one mole of the substance!
so 64 g of NaCl
64 g NaCl
1 mole NaCl
58.44 g NaCl
= 1.1 mol NaCl

8. Homework
How many grams are in 2.3 mol of Co(ClO3)3?