Molar Masses Answers
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How are a mole and a dozen similar?
A
Each represents a certain mass of material.B
Each names a given number of objects.C
Each identifies a specific volume.D
Each measures a given number of amus.2
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What is Avogadro’s number?
A
the number of atoms in exactly 14.00 g of carbon-12B
the number of atoms in a kilogram of any substanceC
the number of atoms, molecules, ions, formula units, or other particles in a mole of a substanceD
the number of atoms, molecules, ions, formula units, or other particles in a gram of a substance3
Which is the molar mass of BF3?
A
10.81 g/molB
29.81 g/molC
48.81 g/molD
67.81 g/mol4
Which value gives the number of particles in 1 mol of a substance?
A
6.02 1021
B
6.02 1022
C
6.02 1023
D
6.02 1024
5
Which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?
A
Both have the same molar mass.B
Both have the same number of ions.C
Both are made up of 6.02 1023 molecules.
D
Both are made up of 6.02 1023 formula units.
6
Consider the equation below.Na+ + Cl– NaClWhich statement best describes the relationship between the substances in the equation?
A
The number of sodium ions is equal to the number of formula units of salt.B
The number of sodium ions is less than the number of chloride ions.C
The number of chloride ions is less than the number of formula units of salt.D
The number of sodium ions is two times the number of formula units of salt.7
What is the molar mass of a substance?
A
the mass in grams of one mole of a substanceB
the number of particles in one gram of a substanceC
the number of moles in one gram of a substanceD
the mass in grams of one particle of a substance8
Magnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron?
A
A mole of iron has more atoms.B
They both have the same mass.C
A mole of magnesium has more mass.D
They both have the same number of atoms.9
What is the molar mass of Al2(SO4)3?
A
150.03 g/molB
278.03 g/molC
342.17 g/molD
450.09 g/mol10
In a classroom, which comparison would a teacher most likely use for describing a mole?
A
a cup of water and a liter of oilB
a dozen eggs and a dozen jellybeansC
a jar of jellybeans and a gram of salt crystalsD
20 marbles in a bag and 10 large ice cubesDid you find these answers helpful?
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