DP Chemistry (first assessment 2025)

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Question 21N.2.HL.TZ0.3c(i)

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

Calculate the standard enthalpy change (ΔH⦵) for the forward reaction in kJ mol−1.

ΔH⦵f PCl3 (g) = −306.4 kJ mol−1

ΔH⦵f PCl5 (g) = −398.9 kJ mol−1

[1]

Markscheme

«−398.9 kJ mol−1 − (−306.4 kJ mol−1) =» −92.5 «kJ mol−1» ✔

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