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Molar Masses — Quiz Answers

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1
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Which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?

A
Both have the same number of ions.
B
Both have the same molar mass.
C
Both are made up of 6 point 0 2 times 10 to the 23th power formula units.
D
Both are made up of 6 point 0 2 times 10 to the 23th power molecules.
2
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What is Avogadro’s number?

A
the number of atoms in exactly 14 point 0 0 g of carbon- 12
B
the number of atoms, molecules, ions, formula units, or other particles in a mole of a substance
C
the number of atoms in a kilogram of any substance
D
the number of atoms, molecules, ions, formula units, or other particles in a gram of a substance
3

Which statement best describes a mole?

A
It is the mass of 12 carbon atoms.
B
It is 12 units of a given substance.
C
It contains 6 point 0 2 times 10 to the 23th power grams of sodium chloride.
D
It contains 6 point 0 2 times 10 to the 23th power particles of a given substance.
4

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

A
20 marbles in a bag and 10 large ice cubes
B
a jar of jellybeans and a gram of salt crystals
C
a cup of water and a liter of oil
D
a dozen eggs and a dozen jellybeans
5

The mole concept will most likely be used in

A
calculating the average height of a mountain range.
B
finding the mass of a piece of steak in a butcher shop.
C
measuring how many liters of gasoline are poured into a tank.
D
determining how many ozone molecules are lost in the atmosphere.
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 more molecules.
B
The molecules cannot be compared without knowing the mass.
C
Each sample has the same number of molecules.
D
1 mol of oxygen has fewer molecules.
7

What is the relationship between a mole and Avogadro’s number?

A
A mole contains Avogadro’s number of particles of a substance.
B
A mole is the amount of a compound that has Avogadro’s number of carbon-12 atoms in it.
C
A mole is the amount of any substance that has the same mass as Avogadro’s number of carbon-12 atoms.
D
A mole is the mass of Avogadro’s number of particles of a substance.
8

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

A
6 point 0 2 times 10 to the 21th power
B
6 point 0 2 times 10 to the 24th power
C
6 point 0 2 times 10 to the 22th power
D
6 point 0 2 times 10 to the 23th power
9

Consider the equation. Na raised to the plus plus Cl raised to the negative right arrow NaCl power power Which 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 sodium ions is two times the number of formula units of salt.
D
The number of chloride ions is less than the number of formula units of salt.
10

Magnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron?

A
They both have the same mass.
B
A mole of iron has more atoms.
C
A mole of magnesium has more mass.
D
They both have the same number of atoms.

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