1. Calculating Molar Mass
On the periodic table, the atomic mass given is the mass (in grams) of one mole of that atom.
Sodium (Na) Molar Mass = g
Magnesium (Mg) = ____ g

2. What about molecules? NaCl has one of each atom
= = g in one mole of NaCl
H20
has 2 hydrogen and 1 oxygen
= 2 (1.0079) = g in one mole of H20

3. You need to be very careful when counting the number of atoms of each element in a molecule.
Count the number of atoms for each element in the molecule:
Ca(OH)2
Na2(CO3)
CH3OH

4. Find the molar mass
NH3
CO3
HCl
Mg(OH)2
Fe3(PO4)2

5. Converting moles to mass
Determine the molar mass of one mole of that molecule
Use a conversion factor
1 mole = ____ g (molar mass)

6. Determine the number of moles:
25 g Li
251 g F2

7. Determine the mass:
2.63 moles of CuSO4
0.73 moles of Mg(OH)2

8. Volume Applies to gases ONLY at STP: 1 mole = 22.4 L
This is referred to as molar volume
STP- Standard Temperature (0°) & Pressure (1 atm)

9. How many grams are there in 28.6 L of carbon monoxide?