DP Chemistry (first assessment 2025)

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Question 22M.2.HL.TZ2.4d(iv)

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Date May 2022 Marks available [Maximum mark: 2] Reference code 22M.2.HL.TZ2.4d(iv)
Level HL Paper 2 Time zone TZ2
Command term Calculate Question number d(iv) Adapted from N/A
d(iv).
[Maximum mark: 2]
22M.2.HL.TZ2.4d(iv)
(d(iv))

Calculate the equilibrium constant, Kc, for this reaction at 298 K. Use your answer to (d)(iii) and sections 1 and 2 of the data booklet.

(If you did not obtain an answer to (d)(iii) use a value of 2.0 kJ mol−1, although this is not the correct answer).

[2]

Markscheme

«ln Kc= – (3.4 × 103 J mol–1 /8.31 J K–1 mol–1 × 298 K)» = –1.37 ✔

«Kc =» 0.25 ✔

Award [2] for “0.45” for the use of 2.0 kJ mol–1 for ΔG⦵.

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