Unit 9—Stoichiometry
Name
Pre-AP Chemistry: Worksheet #4
Period
Date
1.
15.5-g of NH4Cl reacts with an excess of AgNO3. In the reaction 35.5-g AgCl is produced. NH4NO3 is the other
product. What is the percent yield?
2.
Potassium Chlorate decomposes according to the following reaction.
2KClO3  2KCl +3O2
In an experiment 32.5-g of KClO3 is decomposed and 15.2-g of KCl is formed. What is the percent yield?
3.
Nitrogen gas reacts with hydrogen gas to make ammonia (NH3). 15.5-L of N2 reacts at STP to make 30-L of
ammonia. What is the percent yield?
4.
What is the percent yield of oxygen gas if 54L of O2 can be obtained from the thermal decomposition of 500.0 g
of potassium chlorate?
KClO3  KCl + O2
Unit 9—Stoichiometry
5.
It is desired to prepare 100.0g of silicon tetrafluoride by adding hydrogen fluoride to silicon dioxide. The percent
yield of this process is 75%. How much HF do you need to react? The other product is water.
6.
When black gunpowder explodes, potassium nitrate, carbon, and sulfur react with each other to form nitrogen
gas, carbon dioxide gas, and solid potassium sulfide. If the original mixture contains 50.0 g of potassium nitrate,
if the total volume of the gases is 20L, then what is the percent yield for this process?
7.
Very hot zinc will react with steam to form zinc oxide and hydrogen. 5.4L of H2 was used to use up 20.0 g of zinc
completely? What is the percent yield of this process?