STOICHIOMETRY

How can I use stoichiometry to calculate reactant and product amounts?

What is the mole ratio of smores?

Where do mole ratios come from?

2 Gc + 1 M + 4 Cp 1 Smore

Molar Ratios …• help to relate quantities of reactants to products.• are derived from a balanced equation. • adhere to the Law of Conservation of Matter.

Bread : Ham 2: 1

Converting Mass to Mass Problems• Use Road Map Provided • Follow Directions – like following a recipe!

Ex. WHAT MASS OF CARBON IS REQUIRED TO REACT WITH OXYGEN TO PRODUCE 12g OF CO?

_____ C + ______ O2 ______ CO2 1 2

Circle the known. Box what you are trying to find.

GIVEN

12 g CO

g CO

mol CO

C: 1 x 12 = 12O: 1 x 16 = 16 +

28 g/ mol

28

1

mol CO

mol C

2

2

mol C

g C

C: 1 x 12 = 12 g/ mol

1

12= 5.14 g C

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Mass to Volume Conversions

EX. HOW MANY LITERS OF OXYGEN GAS CAN BE PRODUCED BY THE DECOMPOSITION OF

10 g OF POTASSIUM CHLORATE?

_____ KClO3 ______ KCl + _____ O22 2 3

Circle the known. Box what you are trying to find.

GIVEN

10 g KClO3

g KClO3

mol KClO3

K: 1 x 39.0 = 39.0Cl: 1 x 35.5 = 35.5O: 3 x 16 = 48 +

122.5 g/ mol

122.5

1

mol KClO3

mol O2

2

3

mol O2

L O2

1

22.4

1 mol any gas @ STP = 22.4 L

=