DP Chemistry (last assessment 2024)

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Question 18N.2.hl.TZ0.c

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.2.hl.TZ0.c
Level hl Paper 2 Time zone TZ0
Command term Calculate Question number c Adapted from N/A
c.
[Maximum mark: 2]
18N.2.hl.TZ0.c

This reaction is used in the manufacture of sulfuric acid.

2SO2 (g) + O2 (g) ⇌ 2SO3 (g)        Kc = 280 at 1000 K

Calculate the standard Gibbs free energy change, ΔGΘ, in kJ, for this reaction at 1000 K. Use sections 1 and 2 of the data booklet.

[2]

Markscheme

ΔGΘ =«–RT ln Kc =» –8.31 J K–1 mol–1 × 1000 K × ln 280

OR

ΔGΘ = – 4.7 × 104 «J» ✔

 

«ΔGΘ =» – 47 «kJ» ✔

 

Award [2] for correct final answer.

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