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Stoichiometry Loose Ends: Limiting Reactants, Percentage Yield, and Percentage Error

Stoichiometry Loose Ends: Limiting Reactants, Percentage Yield, and Percentage Error. What is a limiting reactant ?. The substance that controls the quantity of products that can form in a chemical reaction.

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Stoichiometry Loose Ends: Limiting Reactants, Percentage Yield, and Percentage Error

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  1. Stoichiometry Loose Ends:Limiting Reactants,Percentage Yield, and Percentage Error

  2. What is a limiting reactant? • The substance that controls the quantity of products that can form in a chemical reaction. • In other words, the reactant that limits the reaction because you run out of it. • Every other reactant is called the excess reactants.

  3. How can we determine what is going to be the limiting reactant? • Convert all reactants into the same product with the same substance unit. • The one that produces less product is the limiting reactant. • So, it is the same as before, but you do it more than once.

  4. Percentage Yield • The ratio of the experimental yield to the theoretical yield • Theoretical yield – book value, “correct answer,” the calculated value, value you were aiming at. • Experimental yield – measured value, experimental value, value you got in the lab

  5. Formula • Divide the experimental value by the theoretical yield and multiply by 100. Experimental yield Theoretical yield X 100

  6. Percentage Error • The margin of error expressed as a percent. • Formula • Take the theoretical yield and subtract the experimental value. • Divide this value by the theoretical yield and multiply by 100% Theoretical yield - Experimental yield Theoretical yield X 100

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