1. Molar Mass

2. What is Molar Mass
The SUM of the atomic masses of the atomic species as given in the molecular formula.
2 x g= g/ mole Cl2
Cl2
Atomic mass from periodic table (Rounded to nearest hundredth)

3. Example 1: Molar Mass of H2O
Given is H2O
Step 1:
H: 2 x 1.01= 2.02 g/mol
O: 1 x = g/mol
Step 2:
Add 2.02 g/mol g/mol=
All answers MUST be rounded to nearest hundredth!!
ANSWER
18.02 g/mol H2O

4. Example2: Molar Mass of Calcium Hydroxide
Given is Calcium Hydroxide = Ca(OH)2
Step 1:
Ca: 1 x 40.08= g/ mol
O: 2 x = g/mol
H: 2 x 1.01 = 2.02 g/mol
Step 2:
Add =
All answers MUST be rounded to nearest hundredth!!
ANSWER
74.10 g/mol Ca(OH)2

5. Practice: Find the molar mass for each of the following
All answers MUST be rounded to nearest hundredth!!
1.) Sodium Hydroxide: NaOH
2.) Magnesium Chloride: MgCl2
3.) Cu(NO3)2
4.) HNO3
5.) Carbon Dioxide:
For # 5 you must provide the formula to calculate the molar mass