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Stoichiometry
Stoichiometry
• the relationship between mass
and moles of reactants and
products in a chemical reaction
Steps for setting up and solving:
1. Write a balanced chemical equation
2. Indicate what is given (known) and
what is required (unknown)
3. Show the mole ratio from the balanced
equation
4. Determine the molar mass of each
substance involved in the problem
5. Use units to set up and solve
SOLVE
EX 1: How many grams of oxygen are
required to oxidize 140 grams of iron
III into Iron III oxide?
iron III + oxygen  iron III oxide
Ex 2: If 50 grams of aluminum
bromide reacts with ammonium
sulfate. How many grams of aluminum
sulfate are produced?
Aluminum bromide + ammonium sulfate 
Stoich Practice
1) A mass of 75 grams of sodium reacts
with water to produce how many grams
of sodium hydroxide?
Sodium + water sodium hydroxide + hydrogen
2) 50 grams of copper II combines with
sulfur to make how much copper II sulfide?
Copper II + sulfur  copper II sulfide