Free Printable Mole Conversions

1.

Which of the following dimensional analysis setups will correctly convert 27.76 g of Li to atoms of Li?

a)

A

b)

B

c)

C

d)

D

2.

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 : 0.664 mol Co

b)

setup A: 2.41x10⁴⁷mol Co

c)

setup A : 0.664 mol Co

d)

setup B: 2.41x10⁴⁷mol Co

3.

(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)

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

4.

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)

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

5.

How would you set up the problem if you have 3.80 moles of calcium (Ca), and you are trying to determine how many atoms of calcium you have?

a)

$3.80\ mol\ Ca\ \times\frac{40.08\ g\ Ca}{1\ mol\ Ca}=$

b)

$3.80\ mol\ Ca\ \times\frac{6.022\ x\ 10^{23\ }atoms\ Ca}{1\ mol\ Ca}=$

c)

$3.80\ mol\ Ca\ \times\frac{1\ g\ Ca}{40.08\ mol\ Ca}=$

d)

$3.80\ mol\ Ca\ \times\frac{1\ atoms\ Ca}{6.022\ x\ 10^{23}\ mol\ Ca}=$

6.

If you're converting between grams and moles you need to use:

a)

1 mole = 6.022x10²³things

b)

the metric prefix chart

c)

molar mass

d)

the atomic number

7.

If you want to convert between atoms and moles you need to use:

a)

1 mole = 6.022x10²³ things

b)

the molar mass

c)

the metric prefix chart

d)

the atomic number

8.

What is the equation for calculating percent composition?

a)

mass of element/mass of compound = x 100

b)

mass of compound/mass of element = x 100

c)

total mass/molar mass = x 100

d)

molar mass/molar mass = x 100

9.

Which conversion factor should be used for the following question " How many molecules are there in 4.00 moles of glucose, C₆H₁₂O₆?

a)

1 mole = 78.12 g

b)

1 mole = 22.4 L

c)

1 mol = 6.02x 10²³ particles

d)

more than one

10.

Which expression below show the correct method of determining the percent composition of Sodium in Na₂CO₃?

a)

%Na = (22.99g/106g) x 100

b)

%Na = (22.99g/106) / 100

c)

%Na = (45.98g/106g) x 100

d)

%Na = (106/45.98g) x 100

11.

If you burned 6.1 x 10²⁴ molecules of ethane, C₂H₆, what mass of ethane did you burn?

a)

10.1 grams

b)

304 grams

c)

1.8 grams

d)

none of the choices

12.

Find the percent composition of hydrogen in (NH₄)₂S.

a)

11.8%

b)

41.1%

c)

47.1%

13.

Which has more molecules?

a)

1 mole H₂O

b)

1 mole Al(OH)₃

c)

1 mole NaCl

d)

There are all the same

14.

If I need 20.4 moles of sodium chloride, how much should I weigh out?

a)

0.549 g

b)

112 g

c)

1192 g

d)

5077 g

15.

What percent of aluminum oxide is oxygen? Assume oxygen has a molar mass of 16 g/mol and aluminum has a molar mass of 27 g/mol

a)

37%

b)

47%

c)

16%

d)

60%

16.

What is the empirical formula for C₄H₆?

a)

CH

b)

CH₃

c)

C₂H₃

d)

C₄H₆

17.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

a)

SO

b)

SO₂

c)

SO₃

d)

SO₄

18.

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

a)

NaPO₂

b)

Na₂PO₃

c)

Na₃PO₄

d)

NaPO₄

19.

Which pair has the same empirical formula?

a)

NaCrO₄ and Na₂Cr₂O₇

b)

C₂H₄O₂ and C₆H₁₂O₆

c)

C₃H₆O₃and C₂H₆O₂

d)

CH₄ and C₂H₆

20.

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

a)

CH₂O

b)

C₂H₄O₂

c)

C₄H₈O₄

d)

C₆H₁₂O₆

21.

What is the molecular formula for a compound with the empirical formula: K₂SO₄and a molecular mass of 696g.

a)

K₂SO₄

b)

K₈SO₁₆

c)

K₈S₄O₈

d)

K₈S₄O₁₆

Mole Conversions

Total questions: 21

Worksheet time: 1hrs 8mins

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