DP Chemistry (last assessment 2024)

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

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

b(i).

[Maximum mark: 1]

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

When heated in air, magnesium ribbon reacts with oxygen to form magnesium oxide.

The reaction in (a)(i) was carried out in a crucible with a lid and the following data was recorded:

Mass of crucible and lid = 47.372 ±0.001 g

Mass of crucible, lid and magnesium ribbon before heating = 53.726 ±0.001 g

Mass of crucible, lid and product after heating = 56.941 ±0.001 g

(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

Very good performance; some calculated the mass of oxygen instead of magnesium for the calculation of the amount, in mol, of magnesium. Others calculated the mass, but not the amount in mol as required.

Syllabus sections

Core

Core » Topic 1: Stoichiometric relationships » 1.2 The mole concept

Core » Topic 1: Stoichiometric relationships

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

Select a Test

Syllabus sections

Confirm action