IDEAL STOICHIOMETRY PROBLEMS
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1. Zn(s) + 2 HCl(aq) = ZnCl2(aq) + H2(g)
a. How many moles of HCl are required for complete reaction of 0.40 moles of zinc?
b. How many moles of hydrogen are produced from the reaction of 0.40 moles of zinc with an excess of
HCl?
c. How many grams of hydrogen are produced from the reaction of 0.40 moles of HCl with an excess of
zinc?
d. How many molecules of hydrogen are produced from the reaction of 4 moles of Zn with?
2. C3H8(g) + 5 O2(g) = 3 CO2(g) + 4 H2O(g)
a. How many moles of O2 are required for complete reaction of 1.5 moles of propane (C3H8)?
b. How many moles of carbon dioxide are produced from the reaction of 1.5 moles of propane with an excess
of oxygen?
c. How many moles of propane are burned when 0.60 moles of carbon dioxide are produced?
d. How many molecules of carbon dioxide are produced from the reaction of 0.20 moles of propane?
3. 4 FeS2(s) + 11 O2(g) = 2 Fe2O3(s) + 8 SO2(g)
a. How many moles of O2 are required for complete reaction of 4.0x10-3 moles of FeS2?
b. How many moles of Fe2O3 should be produced from the reaction of 4.0x10-3 moles of FeS2 with an
excess of oxygen?
c. How many moles of SO2 should be produced from the reaction of 4.0x10-3 moles of FeS2 with an excess
of oxygen?
d. How many molecules of SO2 should be produced from the reaction of 4.0x10-3 moles of FeS2?
4. CH4(g) + 2 O2(g) = CO2(g) + 2 H2O(g)
a. How many grams of O2 are required for complete reaction of 1.6 grams of methane (CH4)?
b. How many grams of water should be produced from the reaction of 1.6 grams of methane with an excess
of oxygen?
c. How many molecules of carbon dioxide should be produced from the reaction of 1.6 grams of methane
with an excess of oxygen?
d. How many grams of methane were burned in an excess of oxygen to produce 7.2 grams of water?
5. 2 H2S(g) + SO2(g) = 3 S(s) + 2 H2O(l)
a. How many grams of SO2 are required for complete reaction of 1.7 grams of hydrogen sulfide?
b. How many grams of S are produced from the reaction of 1.7 grams of hydrogen sulfide with an
excess of sulfur dioxide?
c. How many grams of SO2 with an excess of hydrogen sulfide were used to produce 0.75 grams of
sulfur?
d. How many atoms of S are produced from the reaction of 1.7 grams of hydrogen sulfide with 1.2 g of
sulfur dioxide?
6. 2 Al(s) + 6 HCl(aq) = 2 AlCl3(aq) + 3 H2(g)
a. How many grams of HCl are required for complete reaction of 5.4 grams of aluminum?
b. How many grams of hydrogen gas are produced from the reaction of 5.4 grams of aluminum with an
excess of HCl?
c. How many grams of hydrogen gas are produced from the reaction of 5.4 grams of aluminum with 25
g of HCl?
Analia Sanchez
2/12/2016
Stoichiometry Exercises with percent yield
Solve the following problems. Show all of your work.
1. Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen
gas.
a. Write the balanced equation for this reaction.
b. If you start with 25.0 g of magnesium, how many grams of hydrogen gas will form?
c. If you start with 140.0 g of hydrochloric acid, how many moles of magnesium will
react?
2. Ammonia and oxygen combine to form nitrogen monoxide and water
a. If you start with 80.0 g of O2, how many grams of nitrogen monoxide will you
produce?
b. How many grams of H2O will you make?
3. Ferric oxide plus carbon monoxide gas yields iron metal and carbon dioxide gas
a. How many grams of Fe are made if 0.576 moles of CO2 are produced?
b. 100.0 g CO reacted with excess ferric oxide. If only 114.3 grams of Fe were
produced, what was the percent yield?
4. Plumbous oxide and oxygen gas react to form plumbic oxide
a. How many moles of plumbic oxide will be formed from 334.8 g of lead(II) oxide?
b. How many formula units of product will form from 1,700 liters of O2 at STP and
excess plumbous oxide?
5. Nitrogen gas and hydrogen gas combine to form ammonia (at STP).
a. In the above reaction, how many liters of ammonia will be produced from 7.2 liters of
hydrogen gas?
b. How many grams of nitrogen are needed to produce 460 liters of ammonia?
6. Pentane (C5H12) combusts.
a. How many grams of carbon dioxide form from 320.0 g of pentane?
b. How many grams of water are produced if 200.0 g of CO2 are produced?
c. You start with 150.0 g of pentane. How many grams of H2O will you make?
7.
A solution containing 14.0 g of silver nitrate is added to a solution of excess calcium
chloride. Find the mass of precipitate produced.
Analia Sanchez
2/12/2016