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

Moles & Molar Mass (College Board AP® Chemistry)

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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

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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

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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

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41 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

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51 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

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61 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

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71 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

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81 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

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91 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

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11 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

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21 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

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31 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

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41 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

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51 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

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61 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)

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