Stoichiometry Homework Answers
You must show the balanced chemical reaction and factor label to get credit. Remember to watch sig figs and include units!
Mole-Mole Conversions
1.
How many moles of silver nitrate are required to react with sodium chloride to form 0.258mol silver chloride precipitate and sodium nitrate? 0.258mol
2.
How many moles of propane (C
3
H
8
) are required to make 0.59mol CO
2 by combustion?
0.197mol
3.
How many moles of hydrogen gas are produced if 3.15mol of zinc reacts with excess hydrochloric acid?
3.15mol
4.
How many moles of zinc oxide are produced by the reaction of zinc with 0.980mol of oxygen gas? 1.96mol
5.
How many moles of water can be produced by the decomposition of 0.545mol of iron(III) hydroxide?
0.818mol
Mass-Mass Conversions #1
1.
How many grams of zinc oxide can be formed by reaction 6.02g of zinc with excess oxygen?
7.49g
2.
How many grams of aluminum are needed to react with excess copper(II) chloride solution to form 45.3g of copper and aluminum chloride solution? 12.8g
3.
How many grams of oxygen gas are needed to completely burn 4.98g of butane(C
4
H
10
) to carbon dioxide and water? 17.8g
4.
How many grams of oxygen gas can be produced by the decomposition of 81.2g hydrogen peroxide (H
2
O
2
) to form oxygen and water? 38.2g
5.
How many grams of carbon can react with 8.45g of water to produce carbon monoxide and hydrogen gas? 5.63g
Mass-Mass Conversions #2
1.
If 9.45g of acetylene (C
2
H
2
) is burned in oxygen, how many grams of carbon dioxide are produced? 32.0g
2.
How many grams of oxygen gas can be produced by the decomposition of 0.56g potassium chlorate? 0.22g
3.
How many grams of iron(III) oxide are needed to react with excess carbon monoxide to form 155g of iron and carbon dioxide? 222g
4.
How many grams of oxygen are required to react with 0.76g of aluminum to form aluminum oxide? 0.68g
5.
How many grams of water is required to react with 18.2g of dinitrogen pentoxide to form nitric acid? 3.04g
Titration Practice #1
1.
How many liters of 0.100M sodium hydroxide must be added to 0.0200L of 0.150M nitric acid to completely neutralize the resulting solution? 0.030L
2.
How many milliliters of a 0.254M hydrochloric acid solution must be added to 25.00mL of 0.358M potassium hydroxide to completely neutralize the hydroxide? 35.2mL
3.
How many grams of carbon dioxide are produced by the reaction of 30.0mL of 1.50M nitric acid with excess sodium carbonate if sodium nitrate and water are also formed? 0.990g
4.
What is the minimum volume in mL of 6.0M hydrochloric acid required to completely react with 2.50g of sodium hydrogen carbonate if carbon dioxide, water and sodium chloride are formed? 5.0mL
5.
What is the molarity of an unknown solution of sulfuric acid if 15.00mL of sulfuric acid was titrated to its endpoint by 19.34mL of 0.100M sodium hydroxide? 0.0645M

Titration Practice #2
1.
How many mL of 0.100M hydrochloric acid can be neutralized by reacting with 15.3mL of 0.250M barium hydroxide to produce water and barium chloride? 76.5mL
2.
How many grams of sodium chloride can be produced by the neutralization of 24.5mL of 0.900M sodium hydroxide with excess hydrochloric acid to produce water and sodium chloride? 1.29g
3.
Lab spills of acids are usually neutralized with excess baking soda (sodium hydrogen carbonate). What is the minimum mass of sodium hydrogen carbonate needed to neutralize a spill of 50.0mL of 18.0M sulfuric acid if carbon dioxide, water and sodium sulfate are produced? 151g
4.
The sodium in water demonstration can be quite hazardous. In addition to possible flames and explosions from the hydrogen gas produced, it also produces a caustic solution of sodium hydroxide. What is the
[NaOH] of the solution that is produced when a 2.00g chunk of sodium metal is introduced into enough water so that the final volume of solution is 195mL? Assume that no water or sodium is lost to explosions or fire. 0.446M
5.
10.00mL of household white vinegar, a solution of acetic acid, is titrated with 18.10mL of 0.490M NaOH.
What is the [HC
2
H
3
O
2
] of the vinegar? 0.887M
Gas Stoichiometry Practice
1.
How many liters of oxygen at STP are required to burn 3.00L of acetylene, C
2
H
2
, at STP?
7.50L
2.
How many liters of sulfur dioxide can be produced at STP by the addition of 155mL of 1.00M hydrochloric acid to sodium sulfite if sodium chloride and water are also produced?
1.74L
3.
How many grams of potassium chlorate are needed to decompose to produce 150mL of oxygen gas at STP?
0.55g
4.
How many liters of carbon dioxide can be produced at STP by the reaction of 5.0mL of 0.100M hydrochloric acid with sodium hydrogen carbonate if water and sodium chloride are also produced? 0.011L
5.
How many grams of ethanol (C
2
H
5
OH) are needed to completely react with 5.6L of pure oxygen gas at STP to produce carbon dioxide and water? 3.8g