Tuesday, April 5, 2011

Percent Yield & Percent Purity

Percent Yield is the calculation of the amount of product produced to the amount of product one expected.
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FORMULA
                         grams of actual product recovered
Percent Yield= -----------------------------------------------  x 100%
                         grams of product expected from stoichiometry


On the other hand, Percent Purity is the percentage of the mass of a substance to the mass of the impure substance. This means there are usually some impure substances in a chemical reaction. But we need to calculate the amount of impure substance in an equation for example.

 FORMULA:
                 mass of Pure Substance
% purity=----------------------------- x 100%
                 mass of Impure Substance


For example,

>If a 156.0 g of Cu ore contains 60.00 g of pure Cu metal. What is the percent purity?
                 60.00g of Cu
% purity=------------------ x 100% = 38.46 %
                156.0g of Cu ore
>There are 6.5 grams of impure Zn, the percent purity is 87%, what is the mass of the pure Zn?
                       x
87%= -----------------------
              6.5 g of Impure Zn

so x= 0.87 * 6.5g Impure Zn
     x= 5.6g of pure Zn

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