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Stoichiometry flow chart: In all cases, be sure to have a balanced equation! 1. Problems with one quantity 2. Problems with two quantities One reactant and one product A. This is a regular stoichiometry problem with one calculated quantity (x) 3. Problems with three quantities Both are reactants B. This is a percent yield problem; select the noted product for (x); (x) is now called the theoretical yield. C. This is a limiting reagent problem; select a product for comparison (x) and set up two equations. Divide product value given in problem, now called the experimental yield by calculated (x) Smaller value for (x) was created by limiter D. This is a combination problem; determine limiter, then use value for (x) to calculate percent yield Measuring Chemical Quantities Checklist Skill Sets to Master Counting Atoms in Molecules and Formula Units Write Chemical Formulas Determining Molar Mass Determining Molar Volume of gases @ STP Mole Conversions on the Mole Road Determining Percent Composition Balancing Chemical Equations Identifying Chemical Reaction Types Identify LIMITING Reactant and EXCESS Reactant Observe MOLE RATIOS using a balanced Chem Eqn Determine Theoretical Yield Calculate Percent Yield