Lecture 4.5 – Percent Yield

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Presentation transcript:

Lecture 4.5 – Percent Yield

Today’s Learning Targets LT 4.9 – I can hypothesize and calculate the percent yield for a given chemical reaction.

What is percent yield?

I. Percent Yield Stoichiometry tells us what should happen for a reaction. This is the theoretical yield. We predict using stoichiometry conversions The amount that a reaction actual produces is known as the actual yield.

How do we calculate percent yield?

I. Calculating the Percent Yield Percent yield can be calculated by the equation: Calculate the theoretical yield using stoichiometry. Often, you experiment to obtain the actual yield.

Class Example I perform the following reaction: 2H2 + O2  2H2O and I predict that I will produce 18 g of H2O. If I actually produce 16 g of H2O, then what is my percent yield?

4 KI + K4(CrO4) 2  2 I2 + 2 K2O + K4(CrO3) 2 Class Example I perform the following reaction: 4 KI + K4(CrO4) 2  2 I2 + 2 K2O + K4(CrO3) 2 I react 332 g of KI with excess K4(CrO4)2. If I actually produce 228.6 g of I2, what is my percent yield for the reaction?