DP Chemistry (first assessment 2025)

Question 22M.1A.HL.TZ1.23

Date	May 2022	Marks available	[Maximum mark: 1]	Reference code	22M.1A.HL.TZ1.23
Level	HL	Paper	1A	Time zone	TZ1
Command term	Determine	Question number	23	Adapted from	N/A

23.

[Maximum mark: 1]

22M.1A.HL.TZ1.23

At equilibrium, the concentrations of chlorine and iodine are both 0.02 mol dm^–3.

$\frac{1}{2}$ Cl₂ (g) + $\frac{1}{2}$ $I_{2}$ (g) $⇌$ $I$ Cl (g) K_c = 454

What is the concentration of iodine monochloride, $I$ Cl?

A. $\frac{454}{0.02}$

B. $454 \times 0.02$

C. $\frac{454}{0.04}$

D. $454 \times 0.04$

[1]

Markscheme

Examiners report

High scoring candidates had more success calculating the concentration of ICl in the product given equal concentrations of Cl₂ and I₂ in the reactants.

Syllabus sections

Reactivity 2. How much, how fast and how far? » Reactivity 2.3—How far? The extent of chemical change » Reactivity 2.3.6—The equilibrium law is the basis for quantifying the composition of an equilibrium mixture. Solve problems involving values of K and initial and equilibrium concentrations of the components of an equilibrium mixture.

Question 22M.1A.HL.TZ1.23

Select a Test

Syllabus sections

Confirm action