STOICHIOMETRY REVIEW
MOLE DAY SONG MAKES SENSE NOW!
10 PROBLEMS
• Solve each problem together as a group
• Write your work on notebook paper, one set of
solutions per group
• Rotate writing duties for each problem
• Write your answer on the white board
• Use correct units and sig digs
• Be prepared to show your work
• Any person in any group could be asked to
explain and show work, so be sure you all know
what is going on!
1
• A bike manufacturer has 5350 wheels, 3023
frames, and 2655 handlebars. How many bikes
can be manufactured from these parts?
• 2 wheels + 1 frame + 1 handlebar  1 bike
2
• The alcohol in “gasahol” burns according to
the following equation.
• C2H5OH +3O2  2CO2 + 3H2O
• How many moles of CO2 are produced when
3.00 moles of C2H5OH is burned?
3
• CO2 exhaled by astronauts is removed from
the spaceship atmosphere by reaction with
KOH.
• CO2 +2KOH  K2CO3 + H2O
• How many kg of CO2 can be removed by 1.00
kg KOH?
4
• The limiting reactant in a completed chemical
reaction is the substance
• A. Left over
• B. Used up
• C. With the least mass before the reaction
• D. With the most mass before the reaction
5
• Nitrogen reacts with hydrogen to yield NH3…and
this reaction made Germany a force to be
reckoned with in WW II because it enabled them
to make lots of explosives!
• N2 + 3H2  2NH3
• What volume of H2 is required to react with 3.00
L of N2 at STP
• What volume of NH3 will be produced?
6
• The fermentation of glucose C6H12O6
produces ethyl alcohol, C2H5OH, and CO2
• C6H12O6  2C2H5OH + 2CO2
• How many grams of ethyl alcohol can be
produced from 10.0 g glucose
7
• Octane burns according to the following
equation
• 2C8H18 + 25O2  16CO2 + 18H2O
• How many grams of CO2 are produced when
5.00 g of octane is burned?
8
• Crude iron is produced from iron ore in the
following reaction
• Fe2SO3 + 3CO  2Fe +3CO2
• How many moles of iron are produced from
10. moles of Fe2O3 and 25 mol CO?
9
• Automotive airbags inflate when sodium azide
rapidly decomposes to sodium and N2 via this
reaction
• 2NaN3  2Na + 3N2
• How many grams of sodium azide are required
to form 25.00 g of N2 gas?
• How many liters of N2 is this at STP?
10
• Water is made from H2 and O2.
• Write the balanced chemical equation.
• If we start with 4.6 mole H2 and 3.1 mol O2,
how many moles of H2O are produced?
• What is the excess reactant?
• How many moles of the excess reactant are
left over?
Answers
1. 2655 bikes
2. 6.00 mol CO2
3. .393 kg
4. used up
5. 9.00 L H2 6.00 L NH3
6. 5.11 g ethanol
7. 15.4 g CO2
8. 17 mol Fe
9. 38.7 g NaN3 20.0 L N2
10. 4.6 mol H2O .8 mol O2 in excess