Relative masses of atoms and molecules: past paper questions
Real questions on relative masses of atoms and molecules
The newest 20 of 73 written questions. Open one to see it on the real paper.
- 9701/22 · October/November 2025 · Q1c(ii)[1]
The oxidation state of carbon in methanal is 0. Calculate the oxidation state of carbon in carbon dioxide.
See it on the paper → - 9701/51 · October/November 2025 · Q1a(i)[1]
Calculate the mass of solid silver nitrate, AgNO 3 (s), needed to make 250.0 cm 3 of 0.0500 mol dm –3 AgNO 3 (aq). Give your answer to two decimal places. mass of AgNO 3 (s) = g
See it on the paper → - 9701/51 · October/November 2025 · Q1c(ii)[1]
Calculate the percentage error in the titre volume for titration 3. Show your working. percentage error =
See it on the paper → - 9701/51 · October/November 2025 · Q1d(i)[1]
Calculate the amount, in mol, of AgNO 3 (aq) in the mean titre of 20.65 cm 3 . amount of AgNO 3 = mol
See it on the paper → - 9701/51 · October/November 2025 · Q1d(ii)[1]
Calculate the amount, in mol, of BaCl 2 (aq) in 250 cm 3 of solution A. amount of BaCl 2 = mol
See it on the paper → - 9701/52 · October/November 2025 · Q1a[1]
Calculate the mass of solid potassium thiocyanate, KSCN(s), needed to make 250.0 cm 3 of 0.0200 mol dm –3 KSCN(aq). mass of KSCN(s) = g
See it on the paper → - 9701/21 · May/June 2025 · Q2b(i)[2]
Use Fig. 2.1 to calculate the relative atomic mass, A r , of iron to one decimal place. A r of iron = Show your working.
See it on the paper → - 9701/21 · May/June 2025 · Q2b(ii)[2]
Complete Table 2.1 to show the number of protons and nucleons in one atom of 56 Fe. Table 2.1 particle number of particles in one atom of 56 Fe protons nucleons
See it on the paper → - 9701/22 · May/June 2025 · Q2a(i)[2]
Define relative atomic mass.
See it on the paper → - 9701/42 · May/June 2025 · Q2d(ii)[4]
Calculate the mass, in mg, of iron in one tablet. Assume that all the iron in the tablets is Fe 2+ . Show your working. mass of iron in one tablet = mg
See it on the paper → - 9701/53 · May/June 2025 · Q1b(i)[1]
Suggest how the glassware shown in Fig. 1.1 should be dried before use in step 1.
See it on the paper → - 9701/53 · May/June 2025 · Q1d[1]
In step 1, approximately 1.25 g of Mg powder is needed. Outline how the student should accurately weigh by difference using a weighing boat so that the exact mass of Mg transferred into the flask is known. Include a results table, with appropriate headings, ready for the student to fill in.
See it on the paper → - 9701/53 · May/June 2025 · Q1e[1]
volume of C 6 H 5 Br = cm 3 [M r : C 6 H 5 Br, 156.9] (e) Use the information in Table 1.1 to determine the volume, in cm 3 , of bromobenzene used in step 2.
See it on the paper → - 9701/23 · October/November 2024 · Q1c[2]
Table 1.2 shows the relative abundances of isotopes in a sample of an alloy containing rhodium and iridium only. Table 1.2 (i) isotope relative isotopic mass relative abundance in alloy 103 45 Rh 102.91 50.00 191 77 Ir 190.96 15.18 193 77 Ir 192.96 34.82 Define relative isotopic mass. (ii) Use Table 1.2 to calculate th...
See it on the paper → - 9701/23 · October/November 2024 · Q1c(ii)[2]
Use Table 1.2 to calculate the relative atomic mass, A r , of iridium in the alloy. Give your answer to two decimal places. relative atomic mass of iridium =
See it on the paper → - 9701/23 · October/November 2024 · Q1d(i)[1]
Hydrated rhodium( III ) chloride contains 20.5% by mass of water of crystallisation. Deduce the integer value of x in RhCl 3 •xH 2 O. Show your working.
See it on the paper → - 9701/42 · October/November 2024 · Q4c(iii)[2]
Calculate the M r of FeCr n O 4 and use your answer to deduce the value of n. M r of FeCr n O 4 =
See it on the paper → - 9701/51 · May/June 2024 · Q1b(i)[1]
Calculate the percentage error in the measurement of 5.0 cm 3 of alkaline aqueous potassium iodide by the syringe. Show your working. percentage error =
See it on the paper → - 9701/52 · May/June 2024 · Q1b(i)[1]
Calculate the mass, in g, of CaCO 3 (s) to be weighed using a two-decimal-place balance in step 1. mass of CaCO 3 (s) = g ,
See it on the paper → - 9701/52 · May/June 2024 · Q1b(ii)[2]
Outline how a student should weigh by difference using a weighing boat in order to determine the exact mass of CaCO 3 (s) added to HCl (aq) in the beaker. Draw a results table, with appropriate headings, ready for the student to complete.
See it on the paper →
What examiners said
This question discriminated well. Many candidates lost this mark by multiplying their answer to (i) by 2 instead of by 8.
— Examiner report, October/November 2023, 9701/41 Q5(d)(ii) (Cambridge)
This question was answered well. Many candidates scored credit by error carried forward.
— Examiner report, October/November 2023, 9701/41 Q5(d)(iii) (Cambridge)
Nearly all candidates were able to use the mass and density provided to deduce the volume of methyl benzoate to the nearest 0.05 cm3. A few incorrectly converted 1.15 cm3 to 1.20 cm3 as their final answer.
— Examiner report, May/June 2023, 9701/52 Q1(a)(i) (Cambridge)
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