HONORS CHEMISTRY



CHEMISTRY

Ch. 12.3 Percent Yield

Theoretical Yield:

• Given the quantities of reactants, the maximum quantities of products that can be formed is called the theoretical yield. The theoretical yield is CALCULATED from the mole ratio in the balanced equation

Actual Yield:

• The quantities of products that actually forms when the reaction is carried out in the laboratory or production is called the actual yield.

Percent Yield:

• Measure of the efficacy of a reaction carried out in the laboratory.

Percent Yield = Actual yield x 100%

Theoretical yield

Practice Problems: ** See pages 374-375 in your textbook for help.

1. Calculate the percent yield of Cl2 (g) in the electrolytic decomposition of hydrogen chloride if 25.8 g of HCl produce 13.6 g of chlorine gas.

2HCl (aq) ( Cl2 (g) + H2O (l)

2. One method for reclaiming silver metal from silver chloride results in a 94.6% yield. Calculate the actual mass of silver that can be produced in the reaction if 100.0g of silver chloride is converted to silver metal.

2AgCl (s) ( 2Ag (s) + Cl2 (g)

3. What is the actual amount of magnesium oxide produced when excess carbon dioxide reacts with 42.8g of magnesium metal? The percent yield for MgO(s) for this reaction is 81.7%.

2Mg (s) + CO2(g) ( 2MgO(s) + C (s)

**For homework read 12.3 and answer the questions below:

Part A: Completion

Whenever quantities of two or more reactants are given in a stoichiometric problem, you must identify the __________________. This is the reagent that is completely __________ in the reaction. The amount of limiting reagent determines the amount of ____________ that is formed.

Part B: True\False

___________ 1.) The amount of product can be determined from the amount of excess reagent.

___________ 2.) If you had 100 steering wheels, 360 tires, and enough of every other part needed to assemble a car, the limiting reagent would be tires.

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download