AnswersLA-Chemistry AMolar Masses

Molar Masses Answers

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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.
2
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What is Avogadro’s number?

A
the number of atoms in exactly 14.00 g of carbon-12
B
the number of atoms in a kilogram of any substance
C
the number of atoms, molecules, ions, formula units, or other particles in a mole of a substance
D
the number of atoms, molecules, ions, formula units, or other particles in a gram of a substance
3

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.
4

Which value gives the number of particles in 1 mol of a substance?

A
6.02 1021
Option A
B
6.02 1022
Option B
C
6.02 1023
Option C
D
6.02 1024
Option D
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.
Option C
D
Both are made up of 6.02 1023 formula units.
Option D
6

Consider the equation below.Na+ + Cl– NaClWhich statement best describes the relationship between the substances in the equation?

Question illustration
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

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.
Option B
C
It is the mass of 12 carbon atoms.
D
It contains 6.02 1023 particles of a given substance.
Option D
8

Which is the molar mass of BF3?

A
10.81 g/mol
B
29.81 g/mol
C
48.81 g/mol
D
67.81 g/mol
9

What is the molar mass of a substance?

A
the mass in grams of one mole of a substance
B
the number of particles in one gram of a substance
C
the number of moles in one gram of a substance
D
the mass in grams of one particle of a substance
10

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.
11

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.
12

What is the molar mass of Al2(SO4)3?

A
150.03 g/mol
B
278.03 g/mol
C
342.17 g/mol
D
450.09 g/mol
13

In a classroom, which comparison would a teacher most likely use for describing a mole?

A
a cup of water and a liter of oil
B
a dozen eggs and a dozen jellybeans
C
a jar of jellybeans and a gram of salt crystals
D
20 marbles in a bag and 10 large ice cubes

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