Free Printable Extra Practice- Chapter 10

Worksheets

Extra Practice- Chapter 10

Total questions: 22

Worksheet time: 1hrs 5mins

Name

Class

Date

The molar mass of an element is equal to its...

Atomic mass

Atomic number

Oxidation number

Valence electrons

What is the molar mass of CO₂?

How many particles are in a mole?

602

602 million

602 moles

6.02 x 10²³

Calculate the molar mass of Ba(C₂H₃O₂)₂

255.3 g/mol

237.3 g/mol

228.3 g/mol

196.3 g/mol

How many particles would be in 8.4 moles of Octane (C₈H₁₈)?

5.77 x 10²³

5.04 x 10²⁴

5.77 x 10²⁶

5.04 x 10²³

Determine the amount of moles in 4.50 x 10²³ atoms of fluorine.

9.03 x 10⁴⁶ moles

0.757 moles

4.73 moles

0.0131 moles

Which of the following statements regarding the mole is INCORRECT?

A mole is a unit of quantity equal to 6.02 x 10²³ particles.

The number of particles in a mole is known as Avogadro’s number.

A mole of particles of an element is numerically equal to the atomic mass of the element.

none of the above

What is the molar mass of PbSO₄?

303.27 g/mol

255.27 g/mol

163.87 g/mol

372.27 g/mol

Shivani measures out 6.0 moles of epsom salt (MgSO₄) to put in her bath. How many grams of MgSO₄ went in the bath?

3.6 x 10²⁴ g

720 g

0.050 g

340 g

10.

To melt the ice, Juan throws 455 g of calcium chloride, CaCl₂ on his sidewalk. How many moles of CaCl₂ did he throw?

50,500 moles

4.10 moles

7.56 x 10^-22 moles

111 moles

11.

What is the percent by mass of sodium in NaCl?

39%

61%

35%

65%

12.

Which conversion factor should be used to solve the following, "How many moles of argon atoms are present in 11.2 L of argon gas at STP?" What is the correct answer for the number of moles of argon at STP?

1 mol = 22.4 L , 0.5 mols

1 mol = 39.95 g, 6.28 g

1 mol = 6.02x10²³ atoms, 1.86 X 10^-23

More than 1

13.

What is the volume of 160 g of oxygen gas at STP?

112 L

22.4 L

78.8 L

114.24 L

224 L

14.

What is the empirical formula for C₃H₈

C₃H₈

C₆H₁₆

CH_2.7

15.

Which one is an empirical formula?

H₂O₂

C₂H₆O₁₂

CaCl₂

N₂O₈

16.

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

SO2

SO3

SO4

17.

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

Cu₃C₈

Cu₂O

CuO₄

Cu₄O₁₀

18.

What is the percent by mass of magnesium in MgO?

20%

40%

50%

60%

19.

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

K₂SO₄

K₈SO₁₆

K₈S₄O₈

K₈S₄O₁₆

20.

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

CH₂O

C₂H₄O₂

C₄H₈O₄

C₆H₁₂O₆

21.

Zed went to the store and bought a bag of chips. He estimated there would be 350 chips in the package, but realized there were only 210 chips in that package. What was his percent error?

35%

67%

85%

92%

22.

What is the percent error if the measured (experimental) value is 30.0 g and the accepted (theoretical) value is 32.0 g?

6.67%

6.02%

6.25%

None of the above

100 %

Extra Practice- Chapter 10

Total questions: 22

Worksheet time: 1hrs 5mins

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