Mole Review

Mole Concepts

100

If you start with particles and need moles, what do you do?

Particles divided by Avogadro's # to find moles

200

1 mole of lead (Pb) has this mass and number of atoms 

207.2 g and 6.02x10²³ atoms

300

What are the possible units for Avogadro's Number?

particles: atoms, molecules, and formula units

400

If you start with grams but need moles what do you do? 

Grams divided by (molar mass) grams 

500

What is the correct particle name for each chemical formula?

6.02x10^23 O₂

AlBr₃

C

6.02x10^23 O₂= mole

AlBr₃ = Molecule

C = Atom

Mole/Gram Conversions

100

How many moles are in 79.85 g of Fe₂O₃?

Molar mass Fe₂O₃ = 159.7 g/mol

79.85 g / 159.7 g/mol = 0.5 mol

200

How many grams are in 3.5 mol of Ca₃(PO₄)₂?

Molar mass Ca₃(PO₄)₂ = 310.18 g/mol

3.5 mol X 310.18 g/mol   = 1085.63 g

300

How many moles are in 85 g of AgNO₃? 

BONUS: Name of the Compound

Molar mass = 169.88 g/mol

85g / 169.88 g/mol = 0.5 mol AgNO₃

SILVER NITRATE

400

How many moles are in 62.5 g of sodium sulfate? 

.440 mol Na₂SO₄

500

How many grams is 1.2 moles of H₂O?

22g H₂O

Mole/Particle Conversions

100

How many moles are in 3.01 × 10²⁴ molecules of (NH₄)₂SO₄?

3.01 × 10²⁴ amu / 6.02 x 10²³ amu = 5 mol

200

How many molecules are in 3.996 mol of C₆H₁₂O₆?

3.996 mol X 6.02 x 10²³ amu = 2.406 x 10²⁴ amu

300

How many molecules are in 133.45 mol of SO₂?

133.45 mol x 6.02 x 10²³ = 8.03 x 10²⁵ molecules

400

How many moles are in 1.45 X 10²⁴ formula units of AlCl₃?

2.41 moles

500

How many oxygen atoms are in 132 grams of C₆H₁₂O₆?

2.65 X 10²⁴ oxygen atoms

Molar Mass

100

What is the molar mass of HCl? 

Molar mass HCl = 36.46 g/mol

200

What is the molar mass of H₂CO₃? 

Molar mass = 62.03 g/mol

300

What is the molar mass of LiBr?

Molar mass = 86.84 g/mol

400

What is the molar mass of C₆H₁₂O₆?

Molar mass = 180.18 g/mol

500

What is the molar mass of Ca(OH)₂?

BONUS: What is the name of the compound?

74 g/mol

CALCIUM HYDROXIDE

Conversions

100

120g of C to atoms C 

6.0 x 10²⁴ atoms C

200

20g CaCl₂ to formula units 

1.1 x 10²³ formula units CaCl₂

300

3.25 x 10²⁴ atoms Na to grams 

124g Na

400

2.06 x 10²⁴ formula units of NaCl to grams 

2.00 x 10² g NaCl

500

10 moles of Cu(NO₃)₂ is how many grams? 

BONUS: What is the name of the compound?

Molar Mass Cu(NO₃)_{2 =} 187.56 g/mol

187.56 g/mol x 10 mol = 1875.60 grams

COPPER NITRATE