AP®ChemistryCollege BoardExam QuestionsUnit 1: Atomic Structure & PropertiesMoles & Molar Mass

Moles & Molar Mass (College Board AP® Chemistry): Exam Questions

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Moles & Molar Mass

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11 mark

How many moles of ethane (C2H6) are there in 5.3 g of ethane?

  • 1.8 x 10-1 mol

  • 5.7 mol

  • 18 mol

  • 57 mol

Choose your answer

21 mark

To two decimal places, what is the molar mass of (NH4)2SO4?

  • 114.10 gmol-1

  • 132.14 gmol-1

  • 118.13 gmol-1

  • 160.16 gmol-1

Choose your answer

31 mark

The mass of one atom of calcium is

  • 3.32 x 1023 g

  • 6.66 x 10-23 g

  • 2.41 x 1025 g

  • 1.20 x 1025 g

Choose your answer

41 mark

How many atoms of iron are in 1 mole of Fe2O3

  • 6.022 x 1023

  • 1.807 x 1023

  • 1.204 x 1024

  • 3.011 x 1024

Choose your answer

11 mark

How many molecules of propane (C3H8) does a 23.0 g sample of propane contain?

  • 8.66 x 10-25

  • 1.15 x 1024

  • 3.74 x 1023

  • 3.14 x 1023

Choose your answer

21 mark

The sample that contains the greatest number of moles is

  • 1 g of methanal, CH2O

  • 2 g of carbon dioxide, CO2

  • 3 g of sulfur, S6

  • 4 g of bromine, Br2

Choose your answer

31 mark

How many moles are in 860 atoms of gold?

  • 5.18 x 1026 mols

  • 1.43 x 10-21 mols

  • 4.37 mols

  • 0.23 mols

Choose your answer

41 mark

What is the mass of 8.54 × 1020 particles of Cl2?

  • 0.05 g

  • 2.00 x 10-5 g

  • 1.42 x 10-3 g

  • 0.10 g

Choose your answer

51 mark

Each of the following samples contains the same number of molecules and is stored at identical temperature and pressure.

The sample that has the greatest mass is

  • 1.204 x 1023 molecules of CO

  • 1.204 x 1023 molecules of NH3

  • 1.204 x 1023 molecules of CH4

  • 1.204 x 1023 molecules of H2O

Choose your answer

61 mark

The sample that contains the greatest number of atoms is

  • 0.30 mol of P2O5

  • 0.40 mol of CuSO4.5H2O

  • 0.50 mol of CH3COOH

  • 0.90 mol of H2O

Choose your answer

71 mark

The number of oxygen atoms in 88.0 g of CO2 is

  • 3.01 x 1023

  • 1.20 x 1024

  • 2.41 x 1024

  • 4.82 x 1024

Choose your answer

81 mark

A gas cylinder for a portable heater contains 13 kg of butane.

How many butane molecules are in the gas cylinder?

  • 1.35 x 1026

  • 2.69 x 1024

  • 1.40 x 1026

  • 3.72 x 10-22

Choose your answer

91 mark

The substance that contains the greatest number of moles is

  • 3.00 g of ammonia (NH3)

  • 3.00 g of chloromethane (CH3Cl)

  • 4.00 g of hydrogen sulfide (H2S)

  • 3.50 g of hydrogen chloride (HCl)

Choose your answer

11 mark

The number of ions present in 0.02 mol of (NH4)3PO4 is

  • 8.0 x 10-2

  • 1.2 x 1022

  • 4.8 x 1022

  • 2.4 x 1023

Choose your answer

21 mark

A granule contains 1.5 × 1018 molecules of maltose, C12H22O11.

How many atoms are in the granule, and what is the mass of the granule in milligrams?

  • 1.5 × 1018 atoms and 8.5 mg

  • 6.75 × 1019 atoms and 8.5 x 10-4 mg

  • 1.5 × 1018 atoms and 8.5 x 10-4 mg

  • 6.75 × 1019 atoms and 8.5 mg

Choose your answer