WorksheetsMod Cem: Unit 8 - Basic Stoichiometry
Total questions: 16
Worksheet time: 8mins
Which of the following are conserved in a chemical reaction?
mass
atoms
molecules
coefficients
The amount of product that you should make, which is calculated by doing a stoichiometry problem, is the
actual yield
percent yield
theoretical yield
true yield
The amount of product that is truly made when doing an experiment is the
actual yield
percent yield
theoretical yield
true yield
The molar mass of (NH4)2SO4 is
132.17 g
132.17 g/mol
118.16 g
118.16 g/mol
Which of the following shows the coefficients for the balanced equation shown
2 , 3 , 6 , 1
1 , 1.5 , 3 , 0.5
1 , 3 , 2 , 1
2 , 2 , 5 , 1
How many NH3 molecules will be made given the amount of reactants shown? Reaction equation: N2 + 3H2 → 2NH3
12
8
6
2
What will limit how much product can be made in the equation N2 + 3H2 → 2NH3 if you have the amount of particles shown in the picture?
nitrogen
hydrogen
ammonia
water
You are given 25g of propane (C3H8) and 40g of oxygen. What is the limiting reactant? C3H8 + 5O2 → 4H2O + 3CO2
propane
oxygen
water
carbon dioxide
You have 2.0 mol of Zn and 3.0 mol of HCl. What is the excess reagent? Zn + 2HCl → ZnCl2 + H2
zinc
hydrochloric acid
zinc chloride
hydrogen gas
How many moles of Ag will be produced from 16.0g of Cu, assuming AgNO3 is in excess? Cu + 2AgNO3 → 2Ag + Cu(NO3)2
0.503 mol Ag
54.1g Ag
0.171 mol Ag
0.252 mol Ag
How many grams of Cu(NO3)2 will be produced from 16.0 g of Cu, assuming AgNO3 is in excess? Cu + 2AgNO3 → 2Ag + Cu(NO3)2
47.3 g Cu(NO3)2
31.6 g Cu(NO3)2
0.503 mol Cu(NO3)2
0.252 mol Cu(NO3)2
16.0 g of CaCO3 are broken down, creating 7.54 g of CaO. What is the percent yield of CaO obtained?
1%
84.2%
8.33g
110%
In the combustion of methane, how much water should be made if you burn 10.0 g of methane in excess oxygen?
22.5 g
1.25 g
1.25 mol
27.7 g
Magnesium reacts with oxygen gas to produce magnesium oxide. If 3.3g of magnesium oxide is produced when 3.0 grams of magnesium reacts with excess oxygen, what is the percent yield of magnesium oxide?
4.97 g
0.664 %
66.4 %
60.3 %
Zinc reacts with hydrofluoric acid to produce zinc fluoride and hydrogen gas. How much hydrogen gas should be made if you react 79.1 g of zinc with 163.1 g of hydrofluoric acid?
2.44 g
8.23 g
125.1 g
1.22 g
Magnesium reacts with oxygen to form magnesium oxide by the equation shown. Which of the boxes below show accurately show what you start and end with if you begin with 6 atoms of magnesium and 4 molecules of oxygen?
