Free Printable Mole, Molar Mass High School

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Mole, Molar Mass High School

Total questions: 60

Worksheet time: 2hrs 21mins

Name

Class

Date

What is the numerical value of Avogadro's number?

60.22x10²³

6.022x10²³

6.022x10³²

6.022x10²⁴

How many atoms are found in 1 mol of Xenon atoms?

6.022x10²³

3.011x10²³

1.204x10²⁴

6.022x10²⁴

How many representative particles are found in 1.23 mol of Polonium.

2.41x10²⁴

7.53x10²³

6.02x10²³

1.20x10²⁴

How many moles are in 9.99x10²⁰ atoms of lead?

1.66x10^-3

1.66x10³

1.66

1.66x10^-43

How many moles are in 1.00x10²⁵ Ni²⁺ ions?

1.661 mol

16.61 mol

0.1661 mol

166.1 mol

What is molar mass?

The mass of an atom

The mass of a mole of atoms

The mass of a cute little star-nosed mole

When did we talk about this?

What is the mass of 1.25 mol of Sn?

14.839 g

148.39 g

0.011 g

94.4 g

Which has more atoms, 0.1 mole of silver or 1 mole of gold?

1 mole of gold

0.1 mole of silver

False, they are the same

Not enough information

What is the molar mass of one molecule of Nitrogen N₂?

14.01 amu

14.01 g

28.02 g

28.02 amu

10.

What is the atomic number of Cl

35.5

11.

What is the atomic MASS of Potassium (K)

31.9

209

12.

Molar mass is in units of ________.

grams

grams/mole

mole

moles/gram

13.

How do I calculate the molar mass of a compound?

It is always 6.02 x 10²³

Find the atomic mass of every element in total and add them together

It is always 1

Number of moles x mass

14.

What is this number called?

Avocado's Number

Avogadro's Number

Mendeleev's Number

The mole

15.

How many grams of Hydrogen are there in 25 moles of water?

25 g

450 g

18 g

50 g

16.

What is the empirical formula for this compound?

C₆H₂N₆O₃

C₄HN₅O₁₀

CH₃NO₂

CH₅NO₃

17.

Find the molar mass of C₆H₁₂O₆ ?

217.3 grams per mole

38.8 grams per mole

180.156 grams per mole

2169.6 grams per mole

18.

Which of the following would have more mass?

1 mole of Li

1 mole of Au

1 mole of Si

None, all are equal

19.

How many molecules are there in 31.8 moles of water? (H₂O has a molar mass of 18.0 g/mol)

572 g

1.91 x 10²⁵ molecules

5.28x 10-²⁵molecules

1.77 g

20.

Vitamin C, also known as ascorbic acid, is water soluble and cannot be produced by the human body. Each day, a person's diet should include a source of Vitamin C, such as orange juice. Ascorbic acid has a molecular formula of C₆H₈O₆ and a molar mass of 176 grams per mole.

Determine the number of moles of vitamin C in an orange that contains 0.171 grams of vitamin C.

30.1 moles

1030 moles

.000971 moles

.0001 mole

21.

Calculate the number of moles of chlorine atoms in 55g of copper (II) chloride.

0.41 moles

0.82 moles

1.6 moles

.20 moles

22.

What is the mass of 0.75 moles of (NH₄)₃PO₄?

0.0044 g

91 g

110 g

74 g

23.

Which has more molecules?

1 mole H₂O

1 mole Al(OH)₃

1 mole NaCl

There are all the same

24.

How many molecules are present in 135 g of Teflon C₂F₄

6.13 x 10²³ molecules

5.13 x 10²³ molecules

8.13 x 10 ²³ molecules

9.13 x 10²³ molecules

25.

Which of the following would have the highest number of moles?

4g CO₂

15g H₂O

22g NaCl

100g AgCl

26.

Calculate the % composition by mass of oxygen present in H₂SO₄.

16.3%

65.25%

32.6%

57.14%

27.

What is the molar mass of calcium hydroxide, Ca(OH)₂?

74.1 g/mole

57.1 g/mole

58.1 g/mole

57.1 u

28.

What is the molar mass of Cl₂?

17 g/mol

35.5 g/mo;

71.0 g/mol

89 g/mol

29.

What id the molar mass of UF₆?

101 g/mol

238 g/mol

257 g/mol

352 g/mol

30.

Calculate the molar mass of KOH.

28 g/mol

56 g/mol

84 g/mol

112 g/mol

31.

Calculate the molar mass of CO₂.

14 g/mol

28 g/mol

36 g/mol

44 g/mol

32.

Calculate the molar mass of Ba(C₂H₃O₂)₂

255.3 g/mol

237.3 g/mol

228.3 g/mol

196.3 g/mol

33.

Calculate the molar mass of Cu₂O.

37 g/mol

45 g/mol

79.5 g/mol

143 g/mol

34.

What is the molar mass of the diatomic element nitrogen?

7 g/mol

14 g/mol

28 g/mol

35.

Calculate the molar mass of water (H₂O).

10 g/mol

17 g/mol

18 g/mol

34 g/mol

36.

Calculate the molar mass for Al(OH)₃

78.0 g/mol

72 g/mol

28 g/mol

25 g/mol

37.

Calculate the molar mass of NH₄NO₂

50 g/mol

60 g/mol

64 g/mol

78 g/mol

38.

How many moles are there in 440g of carbon dioxide molecules?

0.25

39.

Calculate the % composition by mass of oxygen present in H₂SO₄.

16.3%

65.25%

32.6%

57.14%

40.

What is the empirical formula of a compound if the molecular formula is W₁₈O₉?

W₁₈O₉

W₂O

W₆O₃

none of the above

41.

What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?

C₃H₈

CH₄

C₂H₂

C₄H₁₀

42.

What is the volume of 5.62 moles of O₂?

125.9 L

0.25 L

179.8 L

0.18 L

43.

What is the volume (in liters) of 3.20 moles of H₂O?

71.7 L

0.14 L

0.17 L

57.6 L

44.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations)

SO₂

SO₃

SO₄

45.

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

C₂H₅

C₄H₁₀

C₁H_2.5

C₄H₈

46.

What is standard temperature?

0^oC

173 K

173.15 K

47.

What is the molar volume of an ideal gas at STP?

1 mol = 22.4 L

1 mol = 0.0821 L

1 mol = 1 L

1 mol = 273 L

48.

What is the volume of 2 moles of gas at STP?

22.4 L

44.8 L

11.2 L

2 L

49.

What is the empirical formula of the following molecular formula: C₃H₆

C₃H₆

CH₂

C₂H₄

CH₃

50.

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

20%

27%

46%

53%

51.

What is the percent by mass of chlorine in NaCl?

39%

61%

35%

65%

52.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations)

SO₂

SO₃

SO₄

53.

A compound came out with the following molar ratio
3 mol Carbon: 1.49 mol Phosphorus: 2 mol Oxygen
What would be the empirical formula?

Ca₆P₃O₄

C₃PO₂

C₆P₃O₄

C₃P₃O₂

54.

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

C₂H₅

C₄H₁₀

C₁H_2.5

C₄H₈

55.

How many moles are in a 18 L tank of nitrogen gas at STP?

0.9 moles

1 mole

0.8 moles

0.6 moles

56.

What is the volume of 5 moles of oxygen gas at STP?

112 L

22.4 L

78.8 L

114.24 L

57.

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?

B : 0.664mol Co

A: 2.41x10⁴⁷mol Co

A : 0.664mol Co

B: 2.41x10⁴⁷mol Co

58.

What do we call the SI unit for amount of a substance?

Avogadro's number

kilogram

mole

liter

59.

Which of the following dimensional analysis setups will correctly convert 2.50 moles of sodium to grams of sodium?

60.

What is the percent composition of a compound that contains 40.8 g carbon and 54.4 g oxygen?

42.9 % carbon; 57.1% oxygen

57.1 % carbon; 42.9 % oxygen

40.8 % carbon; 54.4 % oxygen

54.4 % carbon; 40.8% oxygen

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Mole, Molar Mass High School

Total questions: 60

Worksheet time: 2hrs 21mins

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