Ch400Ch3LN3 - Chem 400 Chapter 3 Lecture Notes Part 3...

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Chem 400 Chapter 3 Lecture Notes Part 3 Limiting Reactant Stoichiometry ¥ You now know how to use a balanced equation to calculate a theoretical yield of products. ¥ But, we made an assumption: we had exactly the correct amount of ALL reactants. ¥ But in reality, we often just throw in a lot of at least one reactant, or we have some reactants in excess. This means that when the reaction is over, whatever was in excess will be leftover. ¥ Although this seems strange, it often helps increase the %-yield by reducing the amount of side reactions. ¥ For example, combustion reactions are typically run with a huge excess of oxygen, to lower the amount of carbon monoxide which is produced. ¥ And if some reactants are in excess, there is usually 1 reactant which is the limiting reactant , that is, the reactant which limits the amount of product which may be made. The limiting reactant is used up in the reaction. The reaction STOPS when the limiting reactant runs out. ¥ So how do we calculate the theoretical yield if there are excess reactants and a limiting reactant?
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This note was uploaded on 06/25/2008 for the course CHEM 400-401 taught by Professor Dr.samples during the Fall '06 term at American River.

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Ch400Ch3LN3 - Chem 400 Chapter 3 Lecture Notes Part 3...

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