c161l8_09_19

# c161l8_09_19 - Reaction Yield All the calculations we've...

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Reaction Yield Reaction Yield W All the calculations we’ve performed assume that the reaction goes to completion and that only the products we’ve written are formed. Sometimes unwanted “by-products” (side-reactions) also occur Products (or reactants) can be lost before they are used or measured W We can calculate the amount of product that should be produced, ideally. This is called theoretical yield.

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% Yield % Yield W The amount of product that is really produced is called the actual yield Cannot be predicted, must be measured % 100 % × = yield l theoretica yield actual Yield
Example Example W 15 kg of Fe 2 O 3 is reduced to Fe. 8.8 kg are produced. What is the % yield? Fe 2 O 3 2Fe (don’t need a complete reaction) Theoretical yield kg mol g O Fe mol Fe mol g mol O Fe kg 49 . 10 85 . 55 1 2 7 . 159 1 15 3 2 3 2 = × × × % Yield % 9 . 83 % 100 49 . 10 8 . 8 % = × = kg kg Yield

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Limiting Reactants W A car factory has 400,000 wheels, 90,000 bodies, and 385,000 doors. How many 4-
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c161l8_09_19 - Reaction Yield All the calculations we've...

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