1.30: Calculate Percentage Yield

PERCENTAGE YIELD: The percentage of yield obtained from the Theoretical Yield

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EQUATION:

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Percentage Yield     =       ( Yield Obtained / Theoretical Yield ) x 100

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Example:

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In an experiment to displace Copper from Copper Sulfate, 6.5 g of Zinc was added to an excess of Copper (II) Sulfate Solution. The Copper was filtered off, washed and dried. The Mass of Copper obtained was 4.8 g. Calculate the Percentage Yield of Copper

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EQUATION OF REACTION:    Zn (s)    +    CuSO4 (aq)     →     ZnSO4 (aq)    + Cu (s) STEP 1: Calculate the Amount, in Moles of Zinc Reacted               Moles of Zinc = 6.5 ÷ 65 = 0.10 Mol STEP 2: Calculate the Maximum Amount of Copper that could be formed               Maximum Moles of Copper = 0.10 Mol STEP 3: Calculate the Maximum Mass of Copper that could be formed               Maximum Mass of Copper = ( 0.110 x 64 ) = 6.4 g STEP 4: Calculate the Percentage of Yield of Copper               Percentage Yield = ( 4.8 ÷ 6.4 ) x 100 = 75%                                                                              Percentage Yield of Copper = 75%