Most Common Chemistry Final Exam Question: Limiting Reactants Review

This Chemistry review covers a common final exam question/ topic. We'll go over how to find the limiting reactant, excess reactant, theoretical yield, percent yield, actual yield and how to find the amount of excess left over.

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I have a chemistry final exam tomorrow for Gen Chem 1. I didn't know stoichiometry or limiting reactant, however, from watching your videos, I not understand both! a MASSIVE thank you! I feel way more confident going into my exam and I am definitely going to keep watching your videos!

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Thank you for this Melissa!😍 I now slightly understand stoichiometry👏

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I’ve watched all most every video on youtube for this and still not completely understanding it THANK YOU my test is today hopefully I pass !!!!

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[jeanalik]

There is an easier way of working out the limiting reactant. Just find the moles of both reactants and use the molar ratio to compare both reactants. The reactant with fewer moles is gonna be your limiting reactant.

[mimimo]

This really took a long time for me to understand the limiting reactants and finding each yield and excess reactants to percentages lol but thank you so much this really helped me greatly.

[konstantinrebrov]

Theoretical yield is the quantity of a product obtained from the complete conversion of the limiting reactant in a chemical reaction. It is the amount of product resulting from a perfect (theoretical) chemical reaction, and thus not the same as the amount you'll actually get from a reaction in the lab. Theoretical yield is commonly expressed in terms of grams or moles.

In contrast to theoretical yield, the actual yield is the amount of product actually produced by a reaction. Actual yield is usually a smaller quantity because few chemical reactions proceed with 100% efficiency because of loss recovering the product and because other reactions may be occurring that reduce the product. Sometimes an actual yield is more than a theoretical yield, possibly because of a secondary reaction that yields additional product or because the recovered product contains impurities.

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