Stoichiometry and Limiting Reagent Calculations

Your Name: Caitlin Lorenzana
Report Sheet for Lesson 11 Experiment
Stoichiometry and Limiting Reagent Calculations
In the previous Lesson, you watched a Video Demonstration about the thermite
reaction, which is used to weld railroad tracks. You may wish to refer back to the video
for this section.
If 1.50 g Fe2O3 and 2.00 g Al are combined, how many grams of Al 2O3 will be produced?
Use the following steps to solve this problem.
Be sure to use units and the rules of significant figures.
1. Balance the thermite reaction:
Fe2O3(s) + 2Al(s) 2Fe(s) + Al2O3(s)
Fe2O3(s) + 2Al(s) 2Fe(s) + Al2O3(s)
2a. Convert 1.50 g Fe2O3 to moles
Show work here.
55.85 ( 2 )+15.999 ( 3 ) =Molar Mass of Fe 2 O3=159.69 g/mol

9.3 x 103 mol

1.5 g Fe2 O3 159.69 g Fe2 O 3
=
=0.0093932mol 9.3 x 103 mol
x
1mol
2b. Convert the moles of Fe2O3 from 2a to moles of Al2O3
Show work here.

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3a. Convert 2.00 g Al to moles
Show work here.

_______________

3b. Convert the moles of Al from 3a to moles of Al 2O3
Show work here.

4. Which is the limiting reactant, Fe2O3 or Al? Why?

______________

Fe2O3
5. Convert the moles of Al2O3 (produced by
the limiting reactant) to grams.
Show work here.

_______________

Stoichiometry: A Reaction of Sodium Bicarbonate and Acetic Acid
Be sure to use units and the rules of significant figures.
6. Mass of 50 mL beaker
7. Mass of beaker and sodium bicarbonate
8. Calculated mass of sodium bicarbonate alone
Show work here.
9. Convert mass of sodium bicarbonate to moles
Show work here.

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10. Theoretical number of moles of acetic acid needed
_______________
Since the balanced equation shows that 1 mole of acetic
acid is needed to react 1 mole of sodium bicarbonate, the theoretical number of moles
of acetic acid needed should be equal to the number of moles of sodium bicarbonate
you measured out.
11. Volume in ml of vinegar added

_______________

12. Calculated ml of acetic acid used

_______________

Show work here.

13. Calculated grams of acetic acid used
Show work here.

_______________

14. Calculated moles of acetic acid used
Show work here.

_______________

Questions:
15. How many moles of NaHCO3 did you measure out?

________________

16. Theoretically, how many moles of acetic acid should have been used to fully react
the measured amount of sodium bicarbonate?
________________
17. Experimentally, how many moles of acetic acid did it take to fully react the sodium
bicarbonate?
________________
18. List at least 2 possible sources of error for the experiment (Why was the
experimental amount of acetic acid different than the theoretical amount) and ways
these errors could have been corrected.

mL vinegar added

pH