DP Chemistry (last assessment 2024)

Question 20N.2.sl.TZ0.1b(iv)

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.2.sl.TZ0.1b(iv)
Level	sl	Paper	2	Time zone	TZ0
Command term	Calculate	Question number	b(iv)	Adapted from	N/A

b(iv).

[Maximum mark: 1]

20N.2.sl.TZ0.1b(iv)

Chlorine undergoes many reactions.

$2.67 g$ of manganese(IV) oxide was added to $200.0 {cm}^{3}$ of $2.00 mol {dm}^{- 3} HCl$ .

${MnO}_{2} (s) + 4 HCl (aq) \to {Cl}_{2} (g) + 2 H_{2} O (l) + {MnCl}_{2} (aq)$

(b(iv))

Calculate the volume of chlorine, in ${dm}^{3}$ , produced if the reaction is conducted at standard temperature and pressure (STP). Use section 2 of the data booklet.

[1]

Markscheme

$« 0.0307 mol \times 22.7 {dm}^{3} {mol}^{- 1} = » 0.697 « {dm}^{3} »$ ✔

Accept methods employing $p V = n R T$ .

Examiners report

60% of the candidates determined the volume of chlorine produced correctly. Some candidates made mistakes in the units when using PV = nRT and had a power of 10 error.

Syllabus sections

Core

Core » Topic 1: Stoichiometric relationships » 1.3 Reacting masses and volumes

Core » Topic 1: Stoichiometric relationships

Question 20N.2.sl.TZ0.1b(iv)

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