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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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 cubes3
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.
4
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 substance5
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
6
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
Which is the molar mass of BF3?
A
10.81 g/molB
29.81 g/molC
48.81 g/molD
67.81 g/mol8
Which is the formula mass of (NH4)2SO4?
A
96.07 amuB
114.12 amuC
116.17 amuD
132.17 amu9
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.10
Which is the molar mass of H2O?
A
10.02 g/molB
16.00 g/molC
17.01 g/molD
18.02 g/molDid you find these answers helpful?
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