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Question 21N.2.hl.TZ0.3c(ii)

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Date November 2021 Marks available [Maximum mark: 1] Reference code 21N.2.hl.TZ0.3c(ii)
Level hl Paper 2 Time zone TZ0
Command term Calculate Question number c(ii) Adapted from N/A
c(ii).
[Maximum mark: 1]
21N.2.hl.TZ0.3c(ii)

White phosphorus is an allotrope of phosphorus and exists as P4.

An equilibrium exists between PCl3 and PCl5.

PCl3 (g) + Cl2 (g) ⇌ PCl5 (g)

(c(ii))

Calculate the entropy change, ΔS, in J K−1 mol−1, for this reaction.

 

Chemistry 2e, Chpt. 21 Nuclear Chemistry, Appendix G: Standard Thermodynamic Properties for Selected Substances https://openstax.org/books/chemistry-2e/pages/g-standard-thermodynamic-properties-for- selectedsubstances# page_667adccf-f900-4d86-a13d-409c014086ea © 1999-2021, Rice University. Except where otherwise noted, textbooks on this site are licensed under a Creative Commons Attribution 4.0 International License. (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/.

[1]

Markscheme

«ΔS = 364.5 J K–1 mol–1 – (311.7 J K–1 mol–1 + 223.0 J K–1 mol–1)=» –170.2 «J K–1 mol–1» ✔

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