DP Chemistry (first assessment 2025)

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Question 22M.2.SL.TZ1.1b(i)

Date	May 2022	Marks available	[Maximum mark: 1]	Reference code	22M.2.SL.TZ1.1b(i)
Level	SL	Paper	2	Time zone	TZ1
Command term	Calculate	Question number	b(i)	Adapted from	N/A

b(i).

[Maximum mark: 1]

22M.2.SL.TZ1.1b(i)

(b(i))

Calculate the amount of magnesium, in mol, that was used.

[1]

Markscheme

$⟨ ⟨ \frac{53.726 g - 47.372 g}{244.31 g {mol}^{- 1}} = \frac{6.354 g}{24.31 g {mol}^{- 1}} ⟩ ⟩ = 0.2614$ «mol» ✔

Examiners report

A number of students were not able to interpret the results and hence find the gain in mass and calculate the moles correctly.

Syllabus sections

Reactivity 2. How much, how fast and how far? » Reactivity 2.1—How much? The amount of chemical change » Reactivity 2.1.2—The mole ratio of an equation can be used to determine: • the masses and/or volumes of reactants and products • the concentrations of reactants and products for reactions occurring in solution. Calculate reacting masses and/or volumes and concentrations of reactants and products.