DP Chemistry (last assessment 2024)

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Question 19N.2.hl.TZ0.a(ii)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.2.hl.TZ0.a(ii)
Level hl Paper 2 Time zone TZ0
Command term Calculate Question number a(ii) Adapted from N/A
a(ii).
[Maximum mark: 2]
19N.2.hl.TZ0.a(ii)

Copper forms two chlorides, copper(I) chloride and copper(II) chloride.

Copper(II) chloride is used as a catalyst in the production of chlorine from hydrogen chloride.

4HCl (g) + O2 (g) → 2Cl2 (g) + 2H2O (g)

Calculate the standard enthalpy change, ΔHθ, in kJ, for this reaction, using section 12 of the data booklet.

[2]

Markscheme

ΔHθ = ΣΔHθf (products) − ΣΔHθf (reactants) ✔
ΔHθ = 2(−241.8 «kJ mol−1») − 4(−92.3 «kJ mol−1») = −114.4 «kJ» ✔

 

NOTE: Award [2] for correct final answer.

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