PERCENT YIELD.

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Presentation transcript:

PERCENT YIELD

VOCABULARY THERORETICAL YIELD: MAXIMUM AMOUNT OF PRODUCT THAT CAN BE PRODUCED FROM A GIVEN AMOUNT OF REACTANT ACTUAL YIELD: MEASURED AMOUNT OF PRODUCT OBTAINED FROM A REACTION In most chemical reactions the amount of product obtained is always less than the theoretical yield

Formula Percent yield = Actual Yield____ x 100% Theoretical Yield Calculations: Step 1: Find theoretical Yield by mass-mass calculations Step 2: Calculate percent yield

Example 1 When 36.8 g of C6H6 react with an excess of Cl2 the actual yield of C6H5Cl is 38.8 g. What is the percent yield of C6H5Cl? C6H6 + Cl2 → C6H5Cl

Example 2 Methanol can be produced through the reaction of CO and H2 in the presence of a catalyst: Co + 2H2 → CH3OH If 75.0 g of CO reacts to produce 68.4 g of CH3OH what is the percent yield?

Example 3 Aluminum reacts with excess copper II sulfate according to the reaction given below. al + Cu(SO4) → Al2(SO4)2 + Cu If 1.85g of Al react and the percent yield of Cu is 56.6%, what mass of Cu is produced?