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WorksheetsMole Conversion Problems
Total questions: 20
Worksheet time: 20mins
Name
Class
Date
1.
Which of the following dimensional analysis setups will correctly convert 27.76g of Li to atoms of Li?
a)
A
b)
B
c)
C
d)
D
2.
Which conversion factor should be used to solve the following, "How many moles are in 28 grams of CO2?"
a)
1 mol = 22.4 L
b)
1 mol = 44.01 g
c)
1 mol = 6.02x1023 atoms
d)
more than one
3.
Which conversion factor should be used to solve the following, "Find the mass in grams of 2.00 x 1023 molecules of F2."
a)
1 mol = 22.4 L
b)
1 mol = 38.00 g
c)
1 mol = 6.02x1023 atoms
d)
more than one
4.
What are the units for molar mass?
a)
grams
b)
amu
c)
grams per mole
d)
liters
5.
What is the molar mass of Hydrogen Peroxide (H2O2)?
a)
48.10 g/mol
b)
34.02 g/mol
c)
36.54 g/mol
d)
35.51 g/mol
6.
How many moles are in 16.94 g of water?
a)
16.94 mol H2O
b)
0.9401 mol H2O
c)
305.3 mol H2O
d)
1.063 mol H2O
7.
How many molecules are in 9.44 moles of AlCl3?
a)
5.68 molec AlCl3
b)
5.68x1024 molec AlCl3
c)
1.25 molec AlCl3
d)
1.25x1023 molec AlCl3
8.
Which of the following would have the highest number of moles?
a)
4 g CO2
b)
15 g H2O
c)
22 g NaCl
d)
100 g AgCl
9.
How many molecules are in 25 mol of NaCl?
a)
1.51x1023
b)
146
c)
4.15
d)
1.51x1025
10.
How many moles of magnesium are in 3.01x1022 atoms of magnesium?
a)
5.00x1044 moles Mg
b)
0.050 moles Mg
c)
1.81x1046 moles Mg
d)
5 moles Mg
11.
Which of the following would have the highest mass?
a)
0.75 mol Co3(PO4)2
b)
12 mol CH4
c)
16.2 mol chlorine gas
d)
1.2 mol IrI3
12.
You have 8.65 x 1025 atoms of arsenic. How many grams do you have?
a)
144 g As
b)
10,765 g As
c)
107 g As
d)
None of these
13.
How many grams of carbon are in 0.63 moles of carbon?
a)
3.79x1023 g C
b)
.0524 g C
c)
7.57 g C
d)
.800 g C
14.
How many molecules are in 3.6 grams of NaCl?
a)
0.06
b)
1.0x1021
c)
1.3x1026
d)
3.7x1022
15.
Which of the following dimensional analysis setups will correctly convert 4.00x1023atoms of cobalt to moles of cobalt? How many moles of colbalt are there?
a)
setup B : 0.6644mol Co
b)
setup A: 2.41x1047mol Co
c)
setup A : 0.664mol Co
d)
setup B: 2.41x1047mol Co
16.
Calculate the number of atoms in 4.00 x 10-5 g of sodium.
a)
1.05 x 1018 atoms
b)
3.92 x 1019 atoms
c)
3.24 x 1023 atoms
d)
5.54 x 1020 atoms
17.
Calculate the number of nitrogen atoms in 20.9 grams of nitrogen.
a)
1.49 moles
b)
0.746 moles
c)
0.37 moles
d)
1.74 moles
18.
What is the mass of 1.0 x 1012 molecules of O2?
a)
1.9 x 1013 g
b)
6.0 x 1011 g
c)
5.3 x 10-11 g
d)
1.7 x 10-12 g
19.
Which represents the greatest number of atoms?
a)
50.0 g Cs
b)
50.0 g Co
c)
50.0 g Ca
d)
50.0 g Cu
20.
What is the molar mass of sodium sulfate, Na2SO4?
a)
71.06 g/mol
b)
94.05 g/mol
c)
142.1 g/mol
d)
215.1 g/mol
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