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All About percentage yeild and what it is also the formula and calculations.

Maria Bargent

on 4 May 2010

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Transcript of Yeild

Yield What is Yield? The Yield of a chemical process compares how much you make with the maximum amount possible. How do we calculate the Yield? --------------------------- = Actual Yield Theoretical Yield How do we calculate the percentage Yield? To find the percentage Yield you multiply
the fractional yield by 100 e.g 0.673 x 100
= 67.3% Theoretical Yield: Theoretical Yield is commonly expressed
as grams or moles. Mole: A mole means 1 portion. The Atomic Mass You will need this number to work out the yeild For example: The mass number is the
top number. It is always
the bigger number. We use Percentage Yeild to find out how much we made and how successful it was. Remember: When you find the masses
of products, you must remember
what goes in MUST come out! But...... Sometimes this doesnt happen, the amount that comes out isnt the same. We call this the YIELD!. The reasons we may get a low yield are: -->The reaction may have been reversable and some may have gone back to reactants. --> some of the reactants may have escaped during the reaction. --> Some of the reactants may have reacted with other things and reacted differently. How to find the theoretical Yield: 1. Find the moles of each reactant present 2. Calculate the moles of a product formed from each mole of reactant 3. Identify the reactant giving the smaller number of moles of product. This reactant
is the Limiting Reagent: 4. Calculate the grams of product produced by the Limiting Reagent. This is the
theoretical yield. ...And thats the basics for percentage Yield Dont forget
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