Silver nitrate solution reacts with calcium chloride solution according to the equation:
2AgNO3 + CaCl2 → Ca(NO3)2 + 2AgCl
All of the substances involved in this reaction are soluble in water except silver chloride, AgCl,
which forms a solid (precipitate) at the bottom of the flask. Suppose we mix together a solution
containing 9.45 g of AgNO3 and one containing 6.30 g of CaCl2.
What mass of AgCl is formed?
2. Silicon carbide, an abrasive, is made by the reaction of silicon dioxide with graphite.
SiO2 + C → SiC + CO
We mix 150.0 g of SiO2 and 101.5 g of C. If the reaction proceeds as far as possible, which
reactant is left over? How much of this reactant remains?
3. Aluminum chloride, Al2Cl6, is an inexpensive reagent used in many industrial processes. It is
made by treating scrap aluminum with chlorine according to the balanced equation:
2Al(s) + 3Cl2(g) → Al2Cl6(s)
a. Which reactant is limiting if 2.70 g Al and 4.05 g Cl2 are mixed?
b. What mass of Al2Cl6 can be produced?
c. What mass of the excess reactant will remain when the reaction is complete?
4. Chromium metal can be produced by the reduction of Cr2O3 with elemental silicon:
2Cr2O3 + 3Si → 4Cr + 3SiO2
If 350.0 grams of Cr2O3 are reacted with 235.0 grams of elemental silicon and 213.2 grams of
chromium metal are recovered, what is the percent yield?
5. The percent yield for the following reaction carried out in carbon tetrachloride solution is 85.6%.
Br2 + Cl2 → 2BrCl
a. What mass of BrCl is theoretically formed from the reaction of 0.0350 mol Br2 with
0.0360 mol Cl2?
b. What would be the actual yield from this experiment?
6. The percent yield of the following reaction is consistently 75.0%.
CH4(g) + 4S(g) → CS2(g) + 2H2S(g)
How many grams of sulfur would be needed to obtain 80.0 g of CS2?
7. Ammonia (NH3) reacts with sulfuric acid (H2SO4) to produce ammonium sulfate ((NH4)2SO4).
What is the theoretical yield of this reaction if 26.80 g of NH3 reacts with 2.40 mol H2SO4?
8. Iron (Fe) is formed when iron(III) oxide (Fe2O3)reacts with carbon monoxide (CO). Carbon
dioxide (CO2) is another product of this reaction. If the percent yield of this reaction is 75.5%,
how many grams of iron are formed when 7.41 g Fe2O3 reacts with 0.720 mol CO?
9. Calculate the mass of excess reagent left at the end of a reaction involving 3.46 g NaOH and
0.0740 mol CO2 (NaHCO3 is produced in this reaction).
10. Calculate the mass of lithium required to produce 4.72 g of lithium nitride (Li3N) in the reaction
with lithium and lots of excess nitrogen gas (N2). Assume the percent yield of this reaction is
80.1%.
11. Hydrochloric acid (HCl) and oxygen gas (O2) react to produce water(H2O) and chlorine gas(Cl2).
If 1.21 g of HCl and 3.99 g O2 are mixed:
a. What is the mass of excess reagent remaining at the end of the reaction?
b. What is the theoretical yield of water for thisreaction?
c. What is the percent yield of this reaction if 0.170 g H2O is actually produced from the
reaction?
12. Determine the molarity of the following solutions:
a. 3.0 g BaCl2 in 30. mL of solution
b. 9.50 g barium hydroxide (Ba(OH)2) in 2000. mL solution
c. 20.0% (w/v) solution of Na2CO3
d. 5.46% (w/v) solution of NaCl
13. 25.0 mL of 0.125 M AgNO3 are mixed with 35.0 mL of 0.100 M Na2SO4 to give solid Ag2SO4. What
is the mass of Ag2SO4 produced in this reaction?
14. 10.2 g of Pb(NO3)2 are mixed with 250.0 mL of a 0.250 M solution of KI. What is the mass of solid
PbI2 produced? How many moles of excess reagent are left when this reaction has gone to
completion?
15. Determine the mass of Ag2S that is produced when 491 mL of a 0.0148 M Na2S solution reacts
with 230 mL of 0.0222 M AgCH3CO2 (silver acetate) solution.
