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Stoichiometry
Test Description: Mole ratio, limited reactants and percent yield
Instructions: Answer all questions to get your test result.
1) How many moles of potassium chloride are produced when 0.0639 moles of potassium reacts with excess of chlorine gas? 2 K + Cl2 ® 2KCl
A
0.256 mol
B
0.128 mol
C
0.0639 mol
D
0.0320 mol
2) In the balanced equation: 2 H2 + O2 = 2 H2O
A
4 moles of hydrogen reacts with 2 moles of oxygen
B
2 moles of hydrogen react with 1 mole of oxygen
C
4 moles of water are produced for every mole of hydrogen reacted
D
2 moles of hydrogen reacts with 2 moles of oxygen
3) What is conserved in every chemical reaction?
A
mass and molecules
B
mass and atoms
C
mass and liters
D
mass and moles
4) The calculated amount of a product that should be produced in a chemical reaction is called the:
A
true yield
B
expected yield
C
theoretical yield
D
actual yield
5) A particlular reaction is expected to produce 2.6 g of sodium. In reality, the reaction only produced 1.9 g of sodium. The percent yield of the reaction is:
A
27%
B
42%
C
73%
D
137%
6) When two substances react to form products, what is the reactant that is used up first called?
A
limiting reactant
B
excess reactant
C
catalytic reactant
D
polyatomic reactant
7) The number of atoms of one mole of an element is equal to
A
one molecule
B
Avogadro’s number
C
one gram
D
Aufbau’s number
8) Where do you find the numbers used for mole ratios?
A
molar masses
B
balanced chemical equation
C
periodic table
D
total mass of products
9) Stoichiometry problems may involve all of the following except:
A
Studying the mole relationship in a chemical reaction
B
Predicting how fast a reaction will occur
C
Converting among moles, particles, mass and volume
D
Determining the relationship between reactants and products
10) How many grams of oxygen are in a sample of 0.0625 mol O2?
A
32.0 g
B
2.00 g
C
1.00 g
D
2.88 g
*select an answer for all questions
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