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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