Free Printable Mole Concept

Worksheets

Mole Concept

Total questions: 25

Worksheet time: 50mins

Name

Class

Date

How many grams does 0.500 moles of NaCl weigh?

29.25 grams (0.500 moles × 58.5 g/mol)

58.5 grams (0.500 moles × 117 g/mol)

14.63 grams (0.500 moles × 29.25 g/mol)

0.500 grams (0.500 moles × 1 g/mol)

How many molecules are there in 0.655 moles of C6H14?

3.95 × $10^{23}$ molecules (0.655 × $6.022 × 10^{23}$ )

6.02 × 10^22 molecules

1.00 × 10^24 molecules

2.50 × 10^23 molecules

How many moles are there in $12.04 \times 10^{24}$ molecules of water?

20 moles ( $12.04 \times 10^{24} \div 6.022 \times 10^{23}$ )

2 moles ( $12.04 \times 10^{24} \div 6.022 \times 10^{24}$ )

120 moles (12.04 × 10^24 ÷ $1.002 × 10^{23}$ )

10 moles $12.04 \times 10^{24} \div 1.204 \times 10^{24}$

Calculate the molecular mass for KOH.

56 g/mol

74 g/mol

39 g/mol

84 g/mol

Convert 18 grams of water (H₂O) to moles.

1 mole

0.5 mole

2 moles

0.1 mole

Convert moles to grams in each of the following: A. 2 mole NH₃ B. 0.5 mole H₂SO₄ (Fill in the blank with the correct mass in grams for each compound.)

A. 2 mole NH₃ = 34 grams B. 0.5 mole H₂SO₄ = 49 grams

A. 2 mole NH₃ = 17 grams B. 0.5 mole H₂SO₄ = 25 grams

A. 2 mole NH₃ = 44 grams B. 0.5 mole H₂SO₄ = 36 grams

A. 2 mole NH₃ = 28 grams B. 0.5 mole H₂SO₄ = 50 grams

Convert the following to moles: A. 3.01 × 10²³ atoms Na B. 6.02 × 10²⁴ molecules CO₂ (Fill in the blank with the correct number of moles for each item.)

A. 3.01 × 10²³ atoms Na = 0.5 moles B. 6.02 × 10²⁴ molecules CO₂ = 10 moles

A. 3.01 × 10²³ atoms Na = 1 mole B. 6.02 × 10²⁴ molecules CO₂ = 12 moles

A. 3.01 × 10²³ atoms Na = 0.25 moles B. 6.02 × 10²⁴ molecules CO₂ = 8 moles

A. 3.01 × 10²³ atoms Na = 2 moles B. 6.02 × 10²⁴ molecules CO₂ = 6 moles

Calculate the molecular mass of the following compounds: a. acetone, CH₃COCH₃ b. ethyl ether, C₄H₁₀O (Fill in the blank with the correct molecular mass for each compound.)

a. acetone, CH₃COCH₃ = 58 g/mol b. ethyl ether, C₄H₁₀O = 74 g/mol

a. acetone, CH₃COCH₃ = 60 g/mol b. ethyl ether, C₄H₁₀O = 72 g/mol

a. acetone, CH₃COCH₃ = 56 g/mol b. ethyl ether, C₄H₁₀O = 70 g/mol

a. acetone, CH₃COCH₃ = 62 g/mol b. ethyl ether, C₄H₁₀O = 76 g/mol

How many moles of hydrogen atoms are there in 1 mole of following molecules?

a. C₃H₈ = 8 moles of H atoms; b. C₂H₅OH = 6 moles of H atoms

a. C₃H₈ = 6 moles of H atoms; b. C₂H₅OH = 8 moles of H atoms

a. C₃H₈ = 3 moles of H atoms; b. C₂H₅OH = 5 moles of H atoms

a. C₃H₈ = 5 moles of H atoms; b. C₂H₅OH = 3 moles of H atoms

10.

How many moles of atoms are there in 2 moles of following molecules?

a. C₁₀H₁₂ = 44 moles of atoms b. CH₃COOH = 16 moles of atoms

a. C₁₀H₁₂ = 20 moles of atoms b. CH₃COOH = 10 moles of atoms

a. C₁₀H₁₂ = 24 moles of atoms b. CH₃COOH = 8 moles of atoms

a. C₁₀H₁₂ = 32 moles of atoms b. CH₃COOH = 12 moles of atoms

11.

How many molecules are present in 1.25 moles of CO₂?

6.02 × 10^22 molecules

7.53 × $10^{23}$ molecules (1.25 × $6.022 × 10^{23}$ )

3.01 × 10^23 molecules

1.00 × 10^24 molecules

12.

Convert 36 grams of glucose (C₆H₁₂O₆) to moles.

0.2 mole

2 moles

0.5 mole

1 mole

13.

How many grams are there in 3 moles of CaCl₂?

333 grams (3 moles × 111 g/mol)

222 grams (3 moles × 74 g/mol)

150 grams (3 moles × 50 g/mol)

111 grams (3 moles × 37 g/mol)

14.

How much is one mole?

6.02 x 10²³

3 x 10⁸

6.67 x 10^-11

6.63 x 10^-34

15.

How many moles are present in 32.3 grams of carbon dioxide (CO₂)?

44.01 moles

1421.52 moles

32.3 moles

0.73 moles

16.

What is the mass in grams of 5.90 mol C₈H_18?

.0512 g

19.4 g

673 g

389 g

17.

What is the percent by mass of oxygen in MgO? Hint: The attached image is an example of a worked problem other than this one.

20%

40%

50%

60%

18.

What is the percent by mass of fluorine in CaF₂(gram-formula mass = 78 g/mol)?

24%

49%

51%

65%

19.

What is the percent composition by mass of sulfur in the compound MgSO₄ (gram formula mass = 120 g/mol)?

20%

27%

46%

53%

20.

Zoe, Abigail, and James are studying chemistry together. They come across a compound with the formula Si₂F₆. They start debating about the empirical formula of this compound. Can you help them?

SiF

Si₂F₆

SiF₃

Si₆F₂

21.

In a chemistry class, Avery, Oliver, and Sophia were given different pairs of compounds and asked to identify which pair has the same empirical formula. Can you help them find the correct pair?

NaCrO₄ and Na₂Cr₂O₇

C₂H₄O₂ and C₆H₁₂O₆

C₃H₆O₃and C₂H₆O₂

CH₄ and C₂H₆

22.

Nora, Avery, and Olivia are studying chemistry together. They come across several formulas and are trying to identify which of these is NOT an empirical formula. Can you help them?

CH2

C2H5

C6H4

C3H7

C5H17

23.

What is the empirical formula for C₄H₆?

CH₃

C₂H₃

C₄H₆

24.

Find the percent composition of Cu₂S?

%Cu= 67.987 %S= 32.013

%Cu= 79.854 %S= 20.145

%Cu= 35.946 %S= 64.054

25.

What is the percent composition of Benzene, C₆H₆?

C = 50%
H = 50%

C = 85.7 %
H = 14.3%

C = 92.2%
H = 7.8%

C = 71.9%
H = 28.1%

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Mole Concept

Total questions: 25

Worksheet time: 50mins

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