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WorksheetsPractice Test on Moles
Total questions: 25
Worksheet time: 50mins
A mole in chemistry is...
a counting unit for representative particles
a burrowing animal
one of the representative elements
also known as molecule
Which of the following statements regarding the mole is INCORRECT?
A mole is a unit of quantity equal to 6.02 x 1023 particles.
The number of particles in a mole is known as Avogadro’s number.
A mole of particles of an element is numerically equal to the atomic mass of the element.
none of the above
They are the smallest part of a substance that retains the properties of that substance.
molar mass
% composition
neutron
representative particles
Which of the following statements is FALSE about Avogadro's number?
It is equivalent to 6.02 x 1023 particles
It is equivalent to 1 mole of a substance
It is the same as the Planck's constant
The units of Avogadro's number may be molecules, ions, or atoms.
Representative particles can be... (Choose 3)
elements
atoms
protons
ions
molecules
The mass of one mole of an element is equal to
its atomic number from the periodic table, but in amus.
its atomic mass from the periodic table, but in amus.
its atomic mass from the periodic table, but in grams.
its atomic number from the periodic table, but in grams.
What is the molar mass of PbSO4?
303.27 g/mol
255.27 g/mol
163.87 g/mol
372.27 g/mol
What is the mass of Ag?
108 g/mol
1 g/mol
6.02 x 1023 g/mol
47 g/mol
What is the mass of Cu?
29 g/mol
64 g/mol
6.02 x 1023 g/mol
1 g/mol
What is the molar mass of ozone, O3?
16 g/mol
32 g/mol
48 g/mol
3 g/mol
A formula that shows the simplest whole-number ratio of the atoms in a compound is the
chemical formula
molecular formula
empirical formula
molar formula
To convert between mass and moles of a substance, use ___________________ as a conversion factor.
molar mass
Avogadro's number
both molar mass and Avogadro's number
atomic number
Where do you find the molar mass of a substance?
from your notes
from memory
from the periodic table
from the ion chart
The molecular formula for octane is C8H18. What is the empirical formula?
C8H18
C1H2
C4H9
CH
A compound’s empirical formula is NO2. If the experimental molar mass is 92 g/mol, what is the molecular formula?
NO2
N2O4
NO
N3O6
The formula that shows the actual number of atoms present in a compound
empirical formula
molecular formula
structural formula
covalent formula
