Free Printable The Mole Concept

Worksheets

The Mole Concept

Total questions: 25

Worksheet time: 1hrs 18mins

Name

Class

Date

How many atoms of iodine are in 1 mole of iodine?

63.55g

126.9

6.02 x 10²³

The number 6.02 x 10²³ is called...

Obama's number

Bohr's number

Trump's number

Avogadro's number

Which has more molecules?

1 mole H₂O

1 mole Al(OH)₃

1 mole NaCl

There are all the same

Avogadro's number of representative particles is equal to one_____.

kilogram

gram

kelvin

mole

What is the molecular mass of one mole of HCl?

79.92 grams per mole of HCl

36.46 grams per mole of HCl

35.45 grams per mole of HCl

1.01 grams per mole of HCl

How many moles are in 4.3 x 10²⁴ molecules of H₂O?

6.02 x 10²³

7.14

18.02

128.66

How many water molecules are in 5.2 moles of water?

6.02 x 10²³

5.2

3.1 x 10²⁴

8.638 x 10^-24

How do we get mass from moles?

multiply by avogadro's number

multiply by molar mass

divide by avogadro's number

divide by molar mass

We use the periodic table to calculate...

mass

molar mass

moles

10.

What would be the mass of 1.5mol H₂O

11.

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

101.75 g

121.75 g

111.75 g

131.75 g

12.

In chemistry, a "mole" is:

The mass of an atom

a large number used to count particles

based on the volume of a substance

13.

Molar mass is in units of ________.

grams

grams/mole

mole

moles/gram

14.

What is the molar mass of Hydrogen Peroxide (H₂O₂)?

48 g/mole

34.02 g/mole

36.5 g/mole

35.5 g/mole

15.

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

16.

Find the percent compositions of all of the elements in KMnO4. Just write in the final answers, please.

4 lines

17.

What’s the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen? Just write in your answers and not your work.

4 lines

18.

The molecular formula for a carbon and hydrogen compound is C₈H₁₈. What is the empirical formula?

C₈H₁₈

C₁₈H₈

C₉H₄

C₄H₉

19.

What is the percent composition of hydrogen in water?

88.8%

66.7%

11.2%

33.3%

20.

It shows the actual number of atoms of each element in a molecule.

Molecular Formula

Empirical Formula

Chemical Formula

Molar Formula

21.

An empirical formula is defined as _______?

The lowest whole number ratio of atoms in a formula.

The actual whole number ratio of atoms in a formula.

The formula showing the ratio of atoms in a formula.

The formula showing the ratio of moles in a formula.

22.

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

Mg₄N₃

MgN₂

Mg₃N₂

MgN

23.

The empirical formula for hydrocarbon A is C₂H₇O. If the molar mass of the hydrocarbon is 141 g/mol, determine the molecular formula for this hydrocarbon.

C₂H₇O

C₄H₁₄O₂

C₆H₂₁O₃

C₈H₂₈O₄

24.

What is the mass of 2.50 mol of oxygen gas O₂?

40 g

80 g

16 g

32 g

25.

Determine the molar mass for CCl₄

153.8 g/mol

47.54 g/mol

189.35 g/mol

82.9 g/mol

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The Mole Concept

Total questions: 25

Worksheet time: 1hrs 18mins

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