plumiThe mole and the Avogadro constant: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 1.1.2 The mole and the Avogadro constant, 2019–2025, with mark schemes and examiner’s reports where available.
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Open the full PDFYour answerQ23(d)
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All 28 questions on The mole and the Avogadro constant, as a list
- June 2025, AS Unit 1, Q4 (1 mark): How many molecules of H2O are present in 1 drop (0.050 cm3) of water? [L = 6.02 × 1023, density of water = 1 g cm–3] A 2.17 × 1026 B 6.69 × 1023 C 1.67 × 1022 D
- June 2025, AS Unit 1, Q16 (1 mark): How many hydrogen atoms are in 14 g of methane? [L = 6.02 × 1023] A 5.268 × 1023 B 6.880 × 1023 C 2.107 × 1024 D 2.752 × 1024
- January 2025, AS Unit 1, Q1 (1 mark): What is the total number of atoms in 8.8 g of carbon dioxide? [Mr value: CO2 = 44 Avogadro constant, L = 6.02 × 1023 mol–1] A 1.2 × 1023 B 3.6 × 1023 C 1.2 × 10
- January 2025, AS Unit 1, Q3 (1 mark): A water molecule, containing the isotopes of hydrogen and oxygen, hydrogen‑1 and oxygen‑16, has a mass of 2.9908 × 10–23 g. What is the mass of an atomic mass u
- January 2025, Unit 5, Q23(d) (3 marks): Nowadays, procaine has been replaced by lidocaine, a related compound, as a local anaesthetic in dentistry. Lidocaine is supplied in 2.2 cm3 cartridges that con
- October 2024, AS Unit 1, Q3 (1 mark): How many oxygen atoms are there in 0.0100 mol of H2SO4? [Avogadro constant, L = 6.020 × 1023 mol–1] A 6.020 × 1021 B 1.204 × 1022 C 2.408 × 1022 D 4.214 × 1022
- October 2024, AS Unit 2, Q8 (1 mark): A 20 g sample of iron(III) sulfate, Fe2(SO4)3 , was dissolved in water. How many sulfate ions are in the solution formed? [Assume Mr Fe2(SO4)3 = 400 Avogadro co
- October 2024, Unit 5, Q15(b) (2 marks): Butylamine has a fishy, ammonia-like smell. The exposure limit or safety level in the atmosphere for butylamine is 15 mg m−3 . Calculate the maximum number of b
- June 2024, AS Unit 1, Q1 (1 mark): How many atoms are there in 10 g of methane? [Ar values: H = 1.0 C = 12.0 L = 6.02 × 1023 mol–1] A 3.76 × 1023 B 9.63 × 1023 C 1.88 × 1024 D 4.82 × 1024
- June 2024 (R), AS Unit 2, Q5 (1 mark): A gas cylinder contains 2.5 kg of butane. How many molecules of butane are in the cylinder? [Molar mass of butane = 58.0 g mol–1 Avogadro constant, L = 6.02 × 1
- January 2024, AS Unit 1, Q8 (1 mark): A block of lead measuring 10 cm × 10 cm × 10 cm contains 3.295 × 1025 atoms. Calculate the density of lead. [Ar value: Pb = 207.2 Avogadro constant, L = 6.02 ×
- January 2024, AS Unit 1, Q12 (1 mark): A sample of seaweed contains 30.0 mg of iodine per kg. What is the number of iodine atoms in 10 kg of this seaweed? [Ar value: I = 126.9 Avogadro constant L = 6
- January 2024, AS Unit 2, Q24(a)(iii) (3 marks): SF6 is a potent greenhouse gas. 1.00 g of SF6 absorbs the same amount of infrared radiation as 23.9 kg of CO2 . Calculate the number of molecules of CO2 , to th
- October 2023, AS Unit 1, Q14 (1 mark): The formula of phosgene is COCl2. What is the total number of atoms in 9.9 g of phosgene? [Avogadro constant (L) = 6.02 × 1023 mol–1 Mr value: COCl2 = 99.0] A 1
- June 2023, Unit 5, Q24(b)(iii) (3 marks): A 740 mg tablet of a painkiller contains 4.0 % PVP by mass. Calculate the number of molecules of PVP polymer in the tablet. (3)
- January 2023, AS Unit 1, Q1 (1 mark): Which compound contains 2.35 × 1022 molecules in 2.50 g? [Avogadro constant L = 6.02 × 1023 mol–1 Mr values: CO = 28.0 CO2 = 44.0 SO2 = 64.1 SO3 = 80.1] A CO B
- January 2023, Unit 5, Q19(c)(vi) (3 marks): A can of a fizzy drink contains 53 mg of aspartame per 100 cm3 of drink. Calculate the number of molecules of aspartame in a 330 cm3 can of the drink. Give your
- October 2022, AS Unit 1, Q9 (1 mark): A piece of copper is shown. 4 cm 8 cm 12 cm How many moles of copper atoms are there in this piece of copper? [Density of copper = 8.96 g cm–3] A 0.675 B 1.48 C
- October 2022, AS Unit 1, Q16(d)(iv) (4 marks): Germane is toxic and the maximum permitted concentration is 0.640 mg m–3 in air. Calculate the maximum number of germane molecules permitted in a laboratory wit
- June 2022, AS Unit 1, Q2 (1 mark): A sample of nitrogen gas contains 1.204 × 1022 molecules. What is the mass of this sample? [Ar N = 14.0 Avogadro constant (L) = 6.02 × 1023 mol−1] A 0.14 g B 0.
- January 2022, AS Unit 1, Q14 (1 mark): The equation for the complete combustion of hexane is shown. C6H14 + 9½ O2 ® 6CO2 + 7H2O How many molecules of carbon dioxide are formed when 2 × 10−3 mol of he
- January 2022, AS Unit 2, Q24(g)(ii) (3 marks): The chemical reactions in the exhaust system of a diesel car, using a catalytic converter, form 89.3 m3 of nitrogen per hour. Calculate the number of molecules
- October 2021, AS Unit 1, Q7(c) (1 mark): What is the total number of ions present in 0.1 mol of the double salt? [Avogadro constant (L) = 6.02 × 1023 mol−1] (1) A 1.80 × 1023 B 2.41 × 1023 C 3.01 × 102
- June 2021, AS Unit 1, Q20 (1 mark): A sample of seawater with a mass of 1 kg contains 6 × 10−9 g of gold. How many atoms of gold, to one significant figure, are there in 1 g of this seawater? [Ar
- January 2021, AS Unit 1, Q2 (1 mark): There are 6.02 × 1023 atoms in 0.25 mol of A He B H2O C BH3 D CH4
- October 2020, AS Unit 1, Q3 (1 mark): How many molecules are there in 44.0 g of carbon monoxide? Avogadro constant L = 6.02 × 1023 mol–1 Ar values: C = 12.0 O = 16.0 A 3.83 × 1023 B 6.02 ×
- January 2020, AS Unit 1, Q21(a) (2 marks): The global production of ethene is about 150 million tonnes per year. Calculate the number of molecules in 150 million tonnes of ethene. [1 tonne = 1000 kg Avog
- January 2019, AS Unit 1, Q22(b)(ii) (2 marks): Calculate the number of nitrogen atoms in 5.60 g of nitrogen gas. [Avogadro constant = 6.02 × 1023 mol−1] (2)
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