DP Chemistry (first assessment 2025)

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Question 21M.2.SL.TZ2.7a

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.2.SL.TZ2.7a
Level	SL	Paper	2	Time zone	TZ2
Command term	State	Question number	a	Adapted from	N/A

a.

[Maximum mark: 1]

21M.2.SL.TZ2.7a

(a)

State the equilibrium constant expression, K_c, for the reaction above.

[1]

Markscheme

«K_c = $\frac{{[{SO}_{3}]}^{2}}{{[{SO}_{2}]}^{2} [O_{2}]}$ » ✓

Square brackets required for the mark.

Syllabus sections

Reactivity 2. How much, how fast and how far? » Reactivity 2.3—How far? The extent of chemical change » Reactivity 2.3.2—The equilibrium law describes how the equilibrium constant, K, can be determined from the stoichiometry of a reaction. Deduce the equilibrium constant expression from an equation for a homogeneous reaction.