Free Printable Moles, Molar Mass and Conversions

1.

What is the molar mass of Fe?

a)

26.0

b)

55.85

c)

81.8

d)

none of these

2.

The mass of one mole of an element is equal to

a)

its atomic number from the periodic table, but in amus.

b)

its atomic mass from the periodic table, but in amus.

c)

its atomic mass from the periodic table, but in grams.

d)

its atomic number from the periodic table, but in grams.

3.

What is the molar mass of PbSO₄?

a)

303.27 g/mol

b)

255.27 g/mol

c)

163.87 g/mol

d)

372.27 g/mol

4.

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

5.

The mass of one mole of substance is called...

a)

molecular mass

b)

mole constant

c)

molar mass

d)

atomic weight

6.

What is the mass of one mole of aluminum chloride (remember to determine the correct formula first)?

a)

62.435g

b)

116.399g

c)

133.341g

d)

97.888g

7.

How many particles are in a mole?

a)

602

b)

602 million

c)

602 moles

d)

6.02 x 10²³

8.

What is the molar mass of the diatomic element nitrogen?

a)

7 g/mol

b)

14 g/mol

c)

28 g/mol

9.

How many water molecules are in 5.2 moles of water?

a)

6.02 x 10²³

b)

5.2

c)

3.1304 x 10²⁴

d)

8.638 x 10^-24

10.

How many grams are in 11.9 moles of chromium?

a)

50 g

b)

619 g

c)

0.23 g

d)

4.4 g

11.

1 mole of Ca and 1 mole of Na have the same number of atoms.

a)

True

b)

False

12.

Convert 50.0 grams of H₂O to moles of H₂O.

a)

901 moles

b)

18.02 moles

c)

2.77 moles

13.

3.0 moles of sodium hydroxide, NaOH, is equal to what mass?

a)

about 40 grams

b)

about 23 grams

c)

about 120 grams

14.

When converting a mass to moles, what unit must be in the denominator of the conversion factor?

a)

grams

b)

moles

c)

grams/mole

15.

When converting a moles to mass, what unit must be in the denominator of the conversion factor?

a)

grams

b)

moles

c)

grams/mole

16.

Choose all of the following that could be used as a conversion factor when converting from atoms to moles.

a)

1 mole = 6.02 x 10²³ atoms

b)

6.02 x 10²³ atoms = 1 mole

c)

6.02 x 10²³ moles = 1 atom

d)

1 atom = 6.02 x 10²³

17.

Calculate the number of atoms in 3.25 moles of lithium.

a)

1.96 x 10²⁴

b)

2.015

c)

1.85 x 10²³

d)

5.40 x 10^-24

18.

Calculate the number of moles in 1.069 x 10²⁵ atoms.

a)

0.0563

b)

6.48 x 10⁴⁸

c)

17.76

d)

5.63 x 10^-2

19.

(Hint: write out how you would solve the problem first on paper before choosing an answer.)

How would you set up the problem if you have a sample of 2.50 g of sodium (Na), how many moles of Na do you have?

a)

$2.50g\ Na\ \times\frac{22.99\ mol\ Na}{1\ g\ Na}=$

b)

$2.50\ g\ Na\ \times\frac{1\ mol\ Na}{22.99\ g\ Na}=$

c)

$2.50\ g\ Na\ \times\frac{22.99\ g\ Na}{1\ mol\ Na}=$

d)

$2.50\ g\ Na\ \times\frac{1\ g\ Na\ }{22.99\ mol\ Na}=$

20.

How would you set up the problem if you want to find the mass, in grams, of 0.55 moles of silicon?

a)

$0.55\ mol\ Si\ \times\ \frac{28.09\ g\ Si}{1\ mol\ Si}\ =\$

b)

$0.55\ mol\ Si\ \times\frac{1\ g\ Si\ }{28.09\ mol\ Si}=$

c)

$0.55\ mol\ Si\ \times\frac{28.09\ mol\ Si}{1\ g\ Si}=$

d)

$0.55\ mol\ Si\ \times\frac{1\ mol\ Si}{28.09\ g\ Si}=$

Moles, Molar Mass and Conversions

Total questions: 20

Worksheet time: 41mins

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