The mole and the Avogadro constant — Paper 1 · A Level Chemistry 9701

1 Use of the Data Booklet is relevant to this question. When a sports medal with a total surface area of 150 cm2 was evenly coated with silver, using electrolysis, its mass increased by 0.216 g. How many atoms of silver were deposited per cm2 on the surface of the medal? A 8.0 × 1018 B 1.8 × 1019 C 1.2 × 1021 D 4.1 × 1022

1 marks

Answer: A

This question in 9701/11 Oct/Nov 2007

31 A monomer undergoes addition polymerisation. A 1 mol sample of the monomer is completely polymerised. How many moles of polymer might, theoretically, be formed? 1 1 2 10–6 1 3 6 .02 × 10 23

1 marks

Answer: C

This question in 9701/11 Oct/Nov 2009

9 Which mass of gas would occupy a volume of 3 dm3 at 25 °C and 1 atmosphere pressure? [1 mol of gas occupies 24 dm3 at 25 °C and 1 atmosphere pressure.] A 3.2 g O2 gas B 5.6 g N2 gas C 8.0 g SO2 gas D 11.0 g CO2 gas

1 marks

Answer: C

This question in 9701/11 May/June 2010

5 Use of the Data Booklet is relevant to this question. Nickel makes up 20 % of the total mass of a coin. The coin has a mass of 10.0 g. How many nickel atoms are in the coin? A 2.05 × 1022 B 4.30 × 1022 C 1.03 × 1023 D 1.20 × 1024

1 marks

Answer: A

This question in 9701/11 Oct/Nov 2010

5 Use of the Data Booklet is relevant to this question. Nickel makes up 20 % of the total mass of a coin. The coin has a mass of 10.0 g. How many nickel atoms are in the coin? A 2.05 × 1022 B 4.30 × 1022 C 1.03 × 1023 D 1.20 × 1024

1 marks

Answer: A

This question in 9701/13 Oct/Nov 2010

6 Use of the Data Booklet is relevant to this question. The volume of a sample of ammonia is measured at a temperature of 60 °C and a pressure of 103 kPa. The volume measured is 5.37 × 10–3 m3. What is the mass of the sample of ammonia, given to two significant figures? A 0.00019 g B 0.0034 g C 0.19 g D 3.4 g

1 marks

Answer: D

This question in 9701/11 Oct/Nov 2012

6 Use of the Data Booklet is relevant to this question. The volume of a sample of ammonia is measured at a temperature of 60 °C and a pressure of 103 kPa. The volume measured is 5.37 × 10–3 m3. What is the mass of the sample of ammonia, given to two significant figures? A 0.00019 g B 0.0034 g C 0.19 g D 3.4 g

1 marks

Answer: D

This question in 9701/12 Oct/Nov 2012

3 Use of the Data Booklet is relevant to this question. The volume of a sample of ammonia was measured at a temperature of 40 °C and a pressure of 95 kPa. The volume measured was 4.32 × 10–5 m3. What is the mass of the sample of ammonia? A 2.7 × 10–5 g B 2.1 × 10–4 g C 2.7 × 10–2 g D 2.1 × 10–1 g

1 marks

Answer: C

This question in 9701/13 Oct/Nov 2012

8 Use of the Data Booklet is relevant to this question. The approximate percentage composition of the atmosphere on four different planets is given in the table below. The density of a gas may be defined as the mass of 1 dm3 of the gas measured at s.t.p. Which mixture of gases has the greatest density? major gases / planet % by number of molecules A Jupiter H2 89.8, He 10.2 B Neptune H2 80.0, He 19.0, CH4 1.0 C Saturn H2 96.3, He 3.25, CH4 0.45 D Uranus H2 82.5, He 15.2, CH4 2.3

1 marks

Answer: D

This question in 9701/11 Oct/Nov 2013

6 Use of the Data Booklet is relevant to this question. In some countries, anhydrous calcium chloride is used as a drying agent to reduce dampness in houses. The anhydrous salt absorbs enough water to form the dihydrate CaCl 2.2H2O. What is the percentage increase in mass? A 14% B 24% C 32% D 36%

1 marks

Answer: C

This question in 9701/13 Oct/Nov 2014

9 Use of the Data Booklet is relevant to this question. When an evacuated glass tube of volume 200 cm3 is filled with a gas at 300 K and 101 kPa, the mass of the tube increases by 1.06 g. What is the identity of the gas? A argon B krypton C neon D xenon

1 marks

Answer: D

This question in 9701/13 Oct/Nov 2014

5 Use of the Data Booklet is relevant to this question. The gas laws can be summarised in the ideal gas equation below. pV = nRT The volume of a sample of methane is measured at a temperature of 60 °C and a pressure of 103 kPa. The volume measured is 5.37 × 10–3 m3. Assume the gas behaves as an ideal gas. What is the mass of the sample of methane, given to two significant figures? A 0.00018 g B 0.0032 g C 0.18 g D 3.2 g

1 marks

Answer: D

This question in 9701/12 May/June 2015

4 In China, the concentration of blood glucose, C6H12O6, is measured in mmol / l . In Pakistan, the concentration of blood glucose is measured in mg / dl . The unit l is a litre (1 dm3). The unit dl is a decilitre (0.1 dm3). A blood glucose concentration of 18.5 mmol / l indicates a health problem. What is 18.5 mmol / l converted to mg / dl ? A 33.3 mg / dl B 178 mg / dl C 333 mg / dl D 3330 mg / dl

1 marks

Answer: C

This question in 9701/12 May/June 2016

3 Which mass of urea, CO(NH2)2, contains the same mass of nitrogen as 101.1 g of potassium nitrate? A 22 g B 30 g C 44 g D 60 g

1 marks

Answer: B

This question in 9701/13 May/June 2016

2 Which would contain 9.03 × 1023 oxygen atoms? A 0.25 mol aluminium oxide B 0.75 mol sulfur dioxide C 1.5 mol sulfur trioxide D 3.0 mol water

1 marks

Answer: B

This question in 9701/12 May/June 2017

5 A fluorescent light tube has an internal volume of 400 cm3 and an internal pressure of 200 kPa. It is filled with 0.03 moles of an ideal gas. What is the temperature of the gas inside the fluorescent light tube? A 3.21 × 10–1 K B 3.21 × 102 K C 3.21 × 105 K D 3.21 × 108 K

1 marks

Answer: B

This question in 9701/13 Oct/Nov 2017

31 One mole of sulfuric acid is used to make an aqueous solution. The solution contains H2SO4 molecules, H+ ions, SO4 2– ions and HSO4 – ions. Which statements are correct? 1 The solution contains 6.02 × 1023 sulfur atoms. 2 The solution contains an exactly equal number of H+ ions and HSO4 – ions. 3 One mole of SO4 2– ions contains two moles of electrons.

1 marks

Answer: D

This question in 9701/11 May/June 2018

36 Under room conditions, 600 cm3 of a gas, X, has a mass of 0.700 g. What could X be? 1 carbon monoxide 2 ethene 3 nitrogen

1 marks

Answer: A

This question in 9701/13 May/June 2018

5 In this question you should assume methane behaves as an ideal gas. The gas laws can be summarised in the ideal gas equation below. pV = nRT The volume of a sample of methane is measured at a temperature of 60 °C and a pressure of 103 kPa. The volume measured is 5.37 × 10–3 m3. What is the mass of the sample of methane, given to two significant figures? A 0.0032 g B 0.018 g C 3.2 g D 18 g

1 marks

Answer: C

This question in 9701/13 Oct/Nov 2018

6 A sample of gas occupies 240 cm3 at 37 °C and 100 kPa. How many moles of gas are present in the sample? A 9.32 × 10–6 B 9.32 × 10–3 C 0.0781 D 78.1

1 marks

Answer: B

This question in 9701/12 Feb/March 2019

31 In an experiment, 10 cm3 of an organic compound, J, in the gaseous state is reacted with an excess of oxygen. Steam, 20 cm3 of carbon dioxide and 5 cm3 of nitrogen are the only products. All gas volumes were measured at the same temperature and pressure. What could be the identity of J? 1 C2H6N2 2 C2H3N 3 C2H7N

1 marks

Answer: C

This question in 9701/12 Feb/March 2019

2 Diamond is a pure form of carbon. The mass of a diamond can be measured in carats. One carat is 0.200 g of carbon. Which expression gives the number of carats that contain 6.02 × 1023 carbon atoms? A 0.200 × 12.0 B 0 . 200 12 . 0 C 12 . 0 0 . 200 0.200 × 12.0 D 6.02 × 10 23

1 marks

Answer: C

This question in 9701/11 Oct/Nov 2019

2 Diamond is a pure form of carbon. The mass of a diamond can be measured in carats. One carat is 0.200 g of carbon. Which expression gives the number of carats that contain 6.02 × 1023 carbon atoms? A 0.200 × 12.0 B 0 . 200 12 . 0 C 12 . 0 0 . 200 0.200 × 12.0 D 6.02 × 10 23

1 marks

Answer: C

This question in 9701/13 Oct/Nov 2019

11 A sample of solid ammonium chloride decomposes on heating. solid ammonium chloride → ammonia gas + hydrogen chloride gas A total of 2.4 × 1021 molecules of gas is formed. How many hydrogen atoms are present in the gaseous products? A 1.2 × 1021 B 2.4 × 1021 C 4.8 × 1021 D 9.6 × 1021

1 marks

Answer: C

This question in 9701/11 May/June 2020

31 Which contain one mole of the underlined substance under room conditions? 1 a balloon containing 24.0 dm3 of helium 2 a block of calcium carbonate weighing 100.1 g 3 4000 cm3 of a 0.250 mol dm–3 solution of sulfuric acid

1 marks

Answer: A

This question in 9701/13 May/June 2020

1 Which contains the largest number of hydrogen atoms? A 0.10 mol of pentane B 0.20 mol of but-2-ene C 1.00 mol of hydrogen molecules D 6.02  1023 hydrogen atoms

1 marks

Answer: C

This question in 9701/11 May/June 2021

1 Which statement about the Avogadro constant is correct? A It is the mass of one mole of any element. B It is the mass of 6.02  1023 atoms of any element. C It is the number of atoms in one mole of neon. D It is the number of atoms in 12 g of any element.

1 marks

Answer: C

This question in 9701/12 May/June 2021

2 Which statement is correct? A 1.0 g of hydrogen gas contains 3.0  1023 atoms. B 4.0 g of helium gas contains 1.2  1024 atoms. C 16 g of methane gas contains 3.0  1024 atoms. D 44 g of carbon dioxide gas contains 6.0  1023 atoms.

1 marks

Answer: C

This question in 9701/12 Oct/Nov 2021

3 Which sample contains the most iodine? A 1 g of CaI2 B 1 g of KI C 1 g of NaI D 1 g of NH4I

1 marks

Answer: D

This question in 9701/12 May/June 2022

1 Which sample contains the same number of the named species as the number of molecules in 35.5 g of chlorine? A atoms in 16 g of sulfur B atoms in 23 g of sodium C ions in 74.5 g of potassium chloride D molecules in 88 g of carbon dioxide

1 marks

Answer: A

This question in 9701/11 Oct/Nov 2022

1 Which sample contains the same number of the named species as the number of molecules in 35.5 g of chlorine? A atoms in 16 g of sulfur B atoms in 23 g of sodium C ions in 74.5 g of potassium chloride D molecules in 88 g of carbon dioxide

1 marks

Answer: A

This question in 9701/13 Oct/Nov 2022

11 Molten aluminium chloride has a simple molecular structure. Each molecule consists of two aluminium atoms and six chlorine atoms. Which statement is correct? A All the chlorine atoms in 1g of molten aluminium chloride have the same mass. B One mole of molten aluminium chloride contains 6.02 × 1023 aluminium atoms. C One mole of molten aluminium chloride contains 3.61 × 1024 chlorine atoms. D The empirical formula of molten aluminium chloride is Al 2Cl 6.

1 marks

Answer: C

This question in 9701/12 Feb/March 2023

2 How many molecules are present in 62 g of solid white phosphorus, P4? A L B 2L C L D L 2 4

1 marks

Answer: C

This question in 9701/12 May/June 2024

2 Which of these samples of gas contains the same number of atoms as 1 g of hydrogen gas? A 22 g of carbon dioxide (Mr: CO2, 44) B 8 g of methane (Mr: CH4, 16) C 20 g of neon (Mr: Ne, 20) D 8 g of ozone (Mr: O3, 48)

1 marks

Answer: C

This question in 9701/13 May/June 2024

7 The diagram shows the apparatus used to find the relative molecular mass of a volatile liquid. When 0.10 g of a volatile liquid is injected into the syringe, all of the volatile liquid evaporates and the volume increases by 85 cm3. The heater maintains a temperature of 400 K and the experiment is carried out at a pressure of 101 300 Pa. syringe volatile liquid injected here thermometer heater If the vapour of the volatile liquid behaves as an ideal gas, which expression can be used to calculate the relative molecular mass of the liquid? A Mr = (85  101 300)  (0.10  8.31  400) B Mr = (85  101.3)  (0.10  8.31  400) C Mr = (0.10  8.31  400)  (85  10–6  101 300) D Mr = (0.10  8.31  400)  (85  10–6  101.3)

1 marks

Answer: C

This question in 9701/13 May/June 2024

3 Glauber’s salt consists of crystals of hydrated sodium sulfate, Na2SO4•xH2O, which can be used for the manufacture of detergents. When a sample of Glauber’s salt was heated, 1.91 g of water was removed leaving 1.51 g of anhydrous Na2SO4. What is the value of x in Na2SO4•xH2O? A 1 B 8.85 C 10 D 11.25

1 marks

Answer: C

This question in 9701/11 Oct/Nov 2024

4 What contains the greatest number of the named particles? A 6.0 dm3 of argon atoms at room conditions B 6.0 g of carbon dioxide molecules C 6.0 g of magnesium atoms D 6.0 g of water molecules

1 marks

Answer: D

This question in 9701/11 Oct/Nov 2024

40 The diagram shows the mass spectrum of a sample of chlorine. Peaks V, W, X, Y and Z are labelled. 100 X V 80 Y 60 relative intensity 40 W 20 Z 0.0 30 40 50 60 70 80 m / e Which statements about this spectrum are correct? 1 The relative atomic mass of chlorine can be calculated from the abundances and m / e values of 2 of the 5 peaks. 2 37.0 g of the species responsible for peak Z contains 3.011  1023 molecules. 3 The relative molecular mass of chlorine can be calculated from the abundances and m / e values of peaks X, Y and Z. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: A

This question in 9701/11 Oct/Nov 2024

4 What contains the greatest number of the named particles? A 6.0 dm3 of argon atoms at room conditions B 6.0 g of carbon dioxide molecules C 6.0 g of magnesium atoms D 6.0 g of water molecules

1 marks

Answer: D

This question in 9701/13 Oct/Nov 2024

40 The diagram shows the mass spectrum of a sample of chlorine. Peaks V, W, X, Y and Z are labelled. 100 X V 80 Y 60 relative intensity 40 W 20 Z 0.0 30 40 50 60 70 80 m / e Which statements about this spectrum are correct? 1 The relative atomic mass of chlorine can be calculated from the abundances and m / e values of 2 of the 5 peaks. 2 37.0 g of the species responsible for peak Z contains 3.011  1023 molecules. 3 The relative molecular mass of chlorine can be calculated from the abundances and m / e values of peaks X, Y and Z. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: A

This question in 9701/13 Oct/Nov 2024

3 What contains 9.03  1023 oxygen atoms? A 0.25mol aluminium oxide B 0.75mol sulfur dioxide C 1.5mol sulfur trioxide D 3.0mol water

1 marks

Answer: B

This question in 9701/11 Oct/Nov 2025