DP Chemistry (last assessment 2024)

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Question 21M.2.hl.TZ1.6b(iv)

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Date May 2021 Marks available [Maximum mark: 3] Reference code 21M.2.hl.TZ1.6b(iv)
Level hl Paper 2 Time zone TZ1
Command term Calculate Question number b(iv) Adapted from N/A
b(iv).
[Maximum mark: 3]
21M.2.hl.TZ1.6b(iv)

When dinitrogen pentoxide, N2O5, is heated the colourless gas undergoes thermal decomposition to produce brown nitrogen dioxide:

N2O5 (g) → 2NO2 (g) + 12O2 (g)

Data for the decomposition at constant temperature is given.

(b(iv))

Calculate the value of the rate constant, k, giving its units.

[3]

Markscheme

k = ∆rate∆N2O5 ✔

«k = 0.75×10-3«mol dm-3 min-1»25×10-3«mol dm-3»= » 0.030 «min–1» ✔

min–1 ✔


M1 can be awarded from correct M2 if not explicitly stated.

Accept k = gradient.

Accept values in the range 0.028–0.032.

Award [3] for correct final answer.

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