Molar Masses Answers
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1
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Which statement best describes a mole?
A
It is 12 units of a given substance.B
It contains 6.02 1023 grams of sodium chloride.
C
It is the mass of 12 carbon atoms.D
It contains 6.02 1023 particles of a given substance.
2
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Which is the molar mass of BF3?
A
10.81 g/molB
29.81 g/molC
48.81 g/molD
67.81 g/mol3
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 substance4
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/mol5
Which is the molar mass of H2O?
A
10.02 g/molB
16.00 g/molC
17.01 g/molD
18.02 g/mol6
What is the molar mass of CHCl3?
A
48.47 g/molB
83.92 g/molC
119.37 g/molD
121.39 g/mol7
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.
8
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.9
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.10
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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