Introduction to Stoichiometry Answers
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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.2
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What is the molar mass of CHCl3?
A
48.47 g/molB
83.92 g/molC
119.37 g/molD
121.39 g/mol3
Which is the molar mass of BF3?
A
10.81 g/molB
29.81 g/molC
48.81 g/molD
67.81 g/mol4
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
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 substance6
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
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.8
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.9
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 cubes10
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
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