How many grams in 2.00 mol Fe?

or 3.00 mol Fe?

or 0.0587 mol Fe?

Molar Mass Conversions

1 mol of Fe

atomsis

55.85 g/mol

Use molar mass to convert between mass and moles.

(get MM from the PT)

grams mol

2.50 mol x 16.00 g = ______ g 1 mol

mol grams

24.02 g x 1 mol = _____ mol12.01 g

Type 3

Type 4

______g = 1 mol

Aluminum satellite dishes resist corrosion because the Al reacts with O2 to form a coating of aluminum oxide (Al2O3).What is the mass of 9.45 mol Al2O3 ?

9.45 mol x

mol gramsType 3

Al2O3

2 (26.98) + 3 (16.00) =

101.96 g/mol

964 g101.96

0.0452 mol x ______g = 1 mol

Find the mass, in grams, of 0.0452 mol C20H42 (wax).

mol gramsType 3

C20H42

20 (12.01) + 42 (1.01) =

282.62 g/mol

12.8 g282.62

______=159.70 g

When iron is exposed to air, it corrodes to form red-brown rust which is iron(III) oxide (Fe2O3).How many moles are in 92.2 g of Fe2O3 ?

92.2 g x

grams molType 4

Fe2O3

2 (55.85) + 3 (16.00) =

159.70 g/mol

0.577 mol1 mol

Find the number of moles in 258 g dinitrogen monoxide.

grams molType 4

N2O

2 (14.01) + 1 (16.00) =

44.02 g/mol

5.86 mol

N2O

______=44.02 g

258 g x 1 mol

1. Where do you look to get the molar mass of an element?

A. Avogadro’s number

B. the periodic table

C. your neighbor’s paper

D. your face

Quick Quiz!

2. Calculate the mass in grams of a sample containing 1.85 mol of water.

A. 1.11 x 1024 g

B. 33.3 g

C. 18.02 g

D. 8460 g

Quick Quiz.

MM = 18.02 g/mol

3. Calculate the number of moles in a spoonful of table salt (NaCl) having a mass of 3.50 g.

A. 208 mol

B. 2.58 103 mol

C. 0.0599 mol

D. 17.0 mol

Quick Quiz.

MM = 58.44 g/mol