Free Printable Counting Atoms Molar Mass and Percent Composition

Worksheets

Counting Atoms Molar Mass and Percent Composition

Total questions: 25

Worksheet time: 3600secs

Name

Class

Date

Molar mass is in units of ________.

grams

grams/mole

mole

moles/gram

What is the molar mass of AuCl₃?

96 g

130 g

232.5 g

303.3 g

What is the definition for Avogadro's number?

number of grams per one mole of a substance

whole number ratio that is a multiple of a chemical formula

simplest, whole number ratio of a chemical formula

6.02 x 10^23 particles per one mole of a substance

Which would have more atoms?

1 mole of Li

1 mole of Au

1 mole of Si

None, all are equal

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

What is the mass in grams of 5.90 mol C₈H_18?

.0512 g

19.4 g

673 g

389 g

How many water molecules are in 5.2 moles of water?

6.02 x 10²³

5.2

3.1304 x 10²⁴

8.638 x 10^-24

Which compound has the smallest molar mass?

CO₂

H₂O

H₂O₂

Which conversion factor should be used to solve the following, "Find the amount of moles of 2.00 x 10²³ molecules of F₂."

Mole - Particle Conversion

Mole -Mass Conversion

10.

How many grams are in 3.3 moles of potassium sulfide?

21.6 g

33 g

235 g

3.6x10² g

11.

How many grams are in 11.9 moles of chromium?

50 g

619 g

0.23 g

4.4 g

12.

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

True

False

13.

1 mole is equivalent to 6.02 x 10²³

False

True

14.

Calculate the number of atoms in 3.25 moles of lithium.

1.96 x 10²⁴

2.015

1.85 x 10²³

5.40 x 10^-24

15.

Calculate the number of moles in 1.622 grams of boron. Do not include the unit in your type answer.

(a)

16.

Calculate the mass (in grams) of

0.95 moles of aluminum. Do not include the unit in your type answer.

(a)

17.

Calculate the number of moles in

6.02 x 10¹⁹ atoms of calcium.

(a)

18.

Calculate the number of atoms in 0.75 moles of helium.

1.25 x 10^-26

4.52 x 10²³

8.03 x 10²³

4.515 x 10²²

19.

How many steps are in a gram to mole conversion?

20.

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

1 mole = 78.12 g

1 mole = 22.4 L

1 mol = 6.02x 10²³ molecules

more than one

21.

The mass % of H in methane (CH₄) is:

75%

92%

25%

22.

The mass % of aluminum in aluminum sulfate is:

12.93%

45.70%

7.89%

35.94%

15.77%

23.

What is the percentage of OH^–in Ca(OH)₂?

45.9%

75%

66.6%

90.1%

24.

Find the percentage composition of Mg in Mg₃(PO₄)₂.

27.48% Mg

43.11% Mg

16.00% Mg

12.63% Mg

25.

What is the percent by mass of sodium in NaCl?

39%

61%

35%

65%

Reset

Counting Atoms Molar Mass and Percent Composition

Total questions: 25

Worksheet time: 3600secs

Similar Resources on Wayground