1. Molar mass Molar mass is the mass of a mole of that thing
The molar mass of pennies is the mass of 6.02X1023 pennies (about 2X1024 grams)
2 million million million tons of pennies
The molar mass of carbon is the mass of 6.02X1023 carbon atoms (which happens to be exactly 12 grams)

2. Molar mass The molar mass of: Ca = 40.08 grams MgCl2 = 95.2 grams
H2O = 18 grams
(using the periodic table)

3. Moles There are one mole of: Atoms in 40.08 grams of Ca (element)
Formula units in 95.2 grams of MgCl2 (ionic)
Molecules in 18 grams of H2O (molecular)
Remember that representative particles refer to the types of substances we are measuring

4. Moles 1 mole of atoms in 40.08 grams of Ca
3 moles of atoms in 95.2 grams of MgCl2
3 moles of atoms in 18 grams of H2O
This will come in handy when we study chemical reactions.

5. Moles
Gram atomic mass (GAM) refers to the mass of one mole of atoms of an element
Gram molecular mass (GMM) refers to the mass of one mole of molecules of a compound
Gram formula mass (GFM) refers to the mass of one mole of formula units of an ionic compound
6.02 X remember this number

6. Representative particle
Name
Formula
Representative particle
Element 1
Element 2
Element 3
Gram atomic mass (GAM)
Strontium Sr
atom -
87.6 g
Iron
Cobalt
Silicon
Aluminum

7. Representative particle Gram formula mass (GFM)
Name
Formula
Representative particle
Element 1
Element 2
Element 3
Gram formula mass (GFM)
Magnesium sulfate
MgSO4
Formula unit Mg S
4 O
123.3 g
Potassium iodide
Calcium sulfite
Lithium oxide
Beryllium fluoride

8. Representative particle Gram molecular mass (GMM)
Name
Formula
Representative particle
Element 1
Element 2
Element 3
Gram molecular mass (GMM)
Carbon tetrachloride
CCl4
molecule C Cl -
153.8 g
Carbon monoxide
Silicon dioxide
Nitrogen
Dihydrogen sulfide

9. How many moles in 26.8 grams of iron?

10. How many moles in 26.8 grams of iron?
We are given grams of iron, so that goes first in the numerator
We want moles, so that must end up in the numerator
Make conversion factors do that

11. How many moles in 26.8 grams of iron?
mole Fe
55.85 g Fe
26.8 g Fe
given
Conversion factor

12. How many moles in 26.8 grams of iron?
mole Fe
55.85 g Fe
26.8 g Fe
Cancel units in numerator and denominator

13. How many moles in 26.8 grams of iron?
mole Fe
55.85 g Fe
26.8 g Fe
.48 mole Fe

14. How many inches in 6.3 km?

15. Conversion factors:
12 in / 1 ft
5280 ft / 1 mi
1 mi = 1.61 km
1 ft / 12 in
1 mi / 5280 ft
1.61 km / 1 mi

16. 6.3 km * 1 mi / 1.61 km * 5280 ft / 1 mi * 12 in / 1 ft

17. 6.3 km * 1 mi / 1.61 km * 5280 ft / 1 mi * 12 in / 1 ft

18. 247930 in How many inches in 6.3 km? Want to know inches
Conversion factors:
12 in / 1 ft
5280 ft / 1 mi
1 mi = 1.61 km
6.3 km * 1 mi / 1.61 km * 5280 ft / 1 mi * 12 in / 1 ft = in