Post on 13-Jan-2016
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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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
=