1. Molar Mass Conversions
10.2
1 mol of Fe atoms is
55.85 g/mol
How many grams in 2 mol Fe?
or 3 mol Fe?
or mol Fe?

2. Use molar mass to convert between mass and moles.
(get MM from the PT)
Type 3
mol grams
2.5 mol x g = ______ g
1 mol
Type 4
grams mol
24.02 g x 1 mol = _____ mol
12.01 g

3. Type 3 mol grams 9.45 mol x 101.96 g = 1 mol 963 g
2 (26.98) + 3 (16.00) =
g/mol

4. Find the mass, in grams, of 0.0452 mol C20H42.
Type 3
mol grams
mol x g =
1 mol
12.8 g
20 (12.01) + 42 (1.01) =
g/mol

5. Type 4 grams mol 92.2 g x 1 mol = 159.7 g 0.577 mol
Rust weakens an iron chain.
2 (55.85) + 3 (16.00) =
159.7 g/mol

6. B3O Find the number of moles in 258 g triboron monoxide. Type 4
grams mol
258 g x 1 mol =
48.43 g
5.33 mol
3 (10.81) + 1 (16.00) =
48.43 g/mol

7. Quick Quiz!
1. Where do you look to get the molar mass of an element?
Avogadro’s number
the periodic table
your neighbor’s paper
your face

8. Quick Quiz.
2. Calculate the mass in grams of a sample containing 1.85 mol of water.
1.11 x 1024 g
33.3 g
18.02 g
8460 g

9. Quick Quiz.
3. Calculate the number of moles in a spoonful of table salt (NaCl) having a mass of g.
208 mol
2.58  103 mol
mol
17.0 mol