DP Chemistry (last assessment 2024)

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Question 18N.2.hl.TZ0.d

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

This reaction is used in the manufacture of sulfuric acid.

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

Predict, giving your reasons, whether the forward reaction is endothermic or exothermic. Use your answers to (b) and (c).

[2]

Markscheme

ΔGΘ < 0/spontaneous AND ΔSΘ < 0/unfavourable ✔

exothermic AND ΔHΘ  «must be» negative/favourable ✔

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