SOLVING LIMITING REAGENT PROBLEMS
SOLVING LIMITING REAGENT PROBLEMS
Once you have done enough practice, you will see that these problems are all the same.
Step 1: Write the balanced chemical equation. Double check
your formula for each entity using your blue sheet.
Check which product is the precipitate if it is a double displacement reaction.
Step 2: Use the given information to find out which reactant is the limiting reagent.
Convert mass of each reactant to moles of each reactant. Then determine the moles of one reactant that is required to react with the other. Compare this to what you actually have and then decide which reactant is limiting and which is in excess.
Step 3: ONLY USE THE LIMITING REACTANT TO
DETERMINE THE YIELD OF PRODUCT.
• From moles of limiting reactant, use stoichiometric ratio to solve for moles of product.
• Then use the molar mass of the product to solve for the mass of the product.
• Make sure your units work!
Is this what the question wants you to calculate? If asked for percentage yield, the calculation you did represents your theoretical yield. The actual yield is the mass you get once you actually do the experiment.
% yield = actual yield x 100
Theoretical yield
Now round off your final answer to the correct number of sig digs. (
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