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Stoichiometry Steps: With Limiting Reactant: 1. Read CAREFULLY and balance equation 1. same 2. Write given and ? under substances 2. write both givens (2 reactants) and ? under substances 3. Find molar masses for given and ? substances 3. same 4. Calculation: ALWAYS THE SAME 3 STEPS! 4. Two calculations: find the mass of product for each reactant g given molar mass want have molar mass (mol ratio) 5. The lesser answer is the answer, and that reactant is the limiting reactant 6. To find the mass of XS left over, use the mass of the LR to calculate the mass of XS reactant used total XS - XS used = mass of XS leftover if % yield is asked for: actual yield theoretical yield x 100% actual yield will be given, how much product actually collected theoretical yield is calculated by the above steps