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# SparkNotes: Stoichiometry: Real World Reactions: Percent Yield

In reactions with multiple starting materials, unless every starting material is consumed in 1:1 ratios with every other and is present in the same molar quantity, one reactant will be consumed first, at which point the reaction will stop.

Percent yield 90. Record the mass of each of your starting materials. 7, edit step 2, convert the mass of your limiting reactant to a number of moles. Do this by dividing the reactant's mass by its molar mass, like in step 3 in Part 1.

To determine which reactant is the limiting reagent 1(a).   Divide the mass (in grams) of the reactant by its molecular weight (in g/mol) OR 1(b). Multiply the amount used (in mL) by its density, then divide by its molar mass 2.  Multiply the mass (your answer from steps 1(a) or 1(b) by the number of moles of the reactant used in the reaction. Unsure of how to calculate molar mass or molecular weight? Click the link below. Watch the lesson now or keep exploring. Got It. You're 25 of the way through this course! Keep going at this rate, and you'll be done before you know it. 1, the first step is always the hardest!

This site is designed to help students calculate theoretical and percent yield. There are links at the bottom of this page for additional tutorials, such as how to balance equations, etc.

Sources and Citations. Gather the purified product from your reaction and calculate its mass it on a balance. Record this mass. 12 Edit step 2 Convert the mass of your product to moles by dividing it by the molecular weight.