0654.C3.2.03 — Calculate reacting masses in simple proportions (calculations will not involve the mole concept): past paper questions
Real questions on 0654.c3.2.03 — calculate reacting masses in simple proportions (calculations will not involve the mole concept)
The newest 13 of 13 written questions. Open one to see it on the real paper.
- 0973/41 · May/June 2025 · Q7d[2]
Calcium carbonate (limestone) is added to the blast furnace to remove impurities from the hematite. The calcium carbonate thermally decomposes to make calcium oxide and carbon dioxide. CaO + CO 2 CaCO 3 Calculate the mass of calcium carbonate needed to make 7 tonnes of calcium oxide. [A r : C, 12; Ca, 40; O, 16] mass o...
See it on the paper → - 0973/32 · May/June 2024 · Q11b(i)[1]
Calculate the percentage of carbon in the alloy. percentage = %
See it on the paper → - 0973/32 · May/June 2024 · Q11b(ii)[1]
The mass of the spanner is 80 g. Calculate the mass of chromium contained in the spanner. mass of chromium = g
See it on the paper → - 0973/41 · May/June 2024 · Q2b(ii)[2]
Calculate the mass of magnesium chloride made when 1.2 g of magnesium reacts with excess hydrochloric acid. Mg + 2HCl MgCl 2 + H 2 [A r : Cl , 35.5; H, 1; Mg, 24] mass of magnesium chloride = g
See it on the paper → - 0973/42 · May/June 2024 · Q11b(i)[3]
Calculate the maximum mass of sulfur trioxide that is made from 1.6 kg of sulfur dioxide. [A r : O, 16; S, 32] mass of sulfur trioxide = kg
See it on the paper → - 0973/31 · October/November 2023 · Q11c(ii)[2]
Table 11.1 shows the percentage composition of a magnesium alloy. Table 11.1 element percentage by mass in the alloy / % aluminium 3.0 magnesium zinc 1.0 Calculate the mass of magnesium contained in 50 kg of the alloy. Show your working. mass of magnesium = kg
See it on the paper → - 0973/41 · October/November 2022 · Q11e[2]
Aluminium reacts with oxygen to make aluminium oxide, Al 2 O 3 . 4Al + 3O 2 2Al 2 O 3 Calculate the maximum mass of aluminium oxide that can be made from 1.35 g of aluminium. Show your working. mass of aluminium oxide = g
See it on the paper → - 0973/31 · May/June 2022 · Q5b(i)[1]
Calculate the mass of aluminium used in 1000 kg of duralumin. mass = kg
See it on the paper → - 0973/32 · May/June 2022 · Q2c(ii)[1]
Calculate the mass of magnesium in 2000 kg of this alloy. mass = kg
See it on the paper → - 0973/41 · May/June 2022 · Q11c[1]
In experiment 1, the student uses dilute hydrochloric acid with a concentration of 0.1 mol / dm 3 . Calculate the concentration of the dilute hydrochloric acid in g / dm 3 . [A r : H, 1; Cl, 35.5] answer = g / dm 3
See it on the paper → - 0973/42 · May/June 2021 · Q5b(i)[2]
Calculate the mass of hydrogen, H 2 , that is needed to make 680 kg of ammonia, NH 3 . [A r : H, 1; N, 14] mass of hydrogen = kg
See it on the paper → - 0973/32 · May/June 2020 · Q5a(i)[1]
Calculate the percentage of aluminium in the Earth’s crust. percentage of aluminium = %
See it on the paper → - 0973/41 · May/June 2020 · Q11c(ii)[2]
In an experiment 5.6 g of ethene reacts with excess steam. Calculate the maximum mass of ethanol that can be made. maximum mass of ethanol = g
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What examiners said
The correct Mr for CaCO3 was frequently seen. Not all candidates realised that the Mr for CaO also needed to be calculated and used to obtain the final answer. Commonly seen incorrect answers were 7 and 700.
— Examiner report, May/June 2025, 0973/41 Q7(d) (Cambridge)
950 kg was frequently given as the mass of the aluminium in the alloy.
— Examiner report, May/June 2022, 0973/31 Q5(b)(i) (Cambridge)
While some candidates were able to convert the concentration of hydrochloric acid from mol / dm3 to g / dm3, many failed to correctly calculate the relative formula mass, using only chlorine.
— Examiner report, May/June 2022, 0973/41 Q11(c) (Cambridge)
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