Molar Masses Answers
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1
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Which is the molar mass of H2O?
A
10.02 g/molB
16.00 g/molC
17.01 g/molD
18.02 g/mol2
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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
3
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.
4
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 substance5
The mole concept will most likely be used in
A
calculating the average height of a mountain range.B
measuring how many liters of gasoline are poured into a tank.C
determining how many ozone molecules are lost in the atmosphere.D
finding the mass of a piece of steak in a butcher shop.6
How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?
A
1 mol of oxygen has fewer molecules.B
1 mol of oxygen has more molecules.C
Each sample has the same number of molecules.D
The molecules cannot be compared without knowing the mass.7
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.8
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.9
Which is the molar mass of BF3?
A
10.81 g/molB
29.81 g/molC
48.81 g/molD
67.81 g/mol10
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.
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