Title:
Percent Yield and Steel Wool Fun!
Purpose:
To calculate the percent yield for a specific reaction.
Intro Material:
What is percent yield? How do I calculate percent yield?
Materials:
Steel Wool, Bunsen Burner, tongs, balance
Procedure and Data:
1) Record the mass of a piece of steel wool. _________g
2) Using the tongs, hold the steel wool in the flame until the reaction stops.
3) Record the mass of the iron (III) oxide which was produced. _________g
Note: This mass is your _____________________yield.
Calculations / Questions:
1) Write a balanced equation for this reaction.
2) Use stoichiometry to determine how many grams of iron (III) oxide should have formed.
Note: This mass is your _____________________yield.
3) Calculate the percent yield for this process?
4) Assuming STP (standard temperature and pressure), what volume of oxygen gas reacted with the steel wool?
Also assume that the entire mass of Iron reacted. Use your new Mole Road Map if necessary.
5) A lab technician reacts 15.0 grams of octane with excess oxygen and is able to recover 22.75 liters of carbon
dioxide gas. Calculate the percent yield for this process. (You must balance the equation first!)
C8H18
+
O2

CO2
+
H2O