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Mole Conversion Practice Problems

Total questions: 10

Worksheet time: 32mins

Name
Class
Date
1.

How many moles of magnesium are in 3.01x1022 atoms of magnesium?

a)

5.00x1044 moles Mg

b)

0.0500 moles Mg

c)

1.81x1046 moles Mg

d)

5.00 moles Mg

2.
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
3.

Which of the following dimensional analysis setups will correctly convert 4.00x1023atoms of cobalt to moles of cobalt? How many moles of cobalt 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

4.

How many formula units are in 2.5 moles of NaCl?

a)

1.5 x1024 formula units

b)

1.5 formula units

c)

4.2 formula units

d)

4.2 x10-24 molecules

5.

How many moles of copper are present in a sample that contains 4.57 x 1013 atoms of copper?

a)

7.59 x 10-11 moles

b)

2.75 x 1037 moles

c)

7.59 x 1011 moles

d)

2.75 x 1033 moles

6.

How many grams are in 1.2 moles of neon?

a)

0.059 grams

b)

7.2 x 1023 grams

c)

2.0 x 10-24 grams

d)

24 grams

7.

How many molecules are there in 31.8 moles of water?

a)

5.28 x 10-23 molecules

b)

1.91 x 1025 molecules

c)

5.28x 10-25 molecules

d)

1.91 x 1022 molecules

8.

How many formula units are there in 2.45 moles of potassium chloride?

a)

4.07 x 10-24

b)

1.47 x 1024

c)

1.47

d)

4.07

9.

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

10.

You have 8.65 x 1025 atoms of arsenic. What is the mass of the sample?

a)
144 g As
b)
10,765 g As
c)
107 g As
d)
None of these