DP Chemistry (last assessment 2024)

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Question 22M.2.hl.TZ2.c(i)

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.hl.TZ2.c(i)
Level hl Paper 2 Time zone TZ2
Command term Draw Question number c(i) Adapted from N/A
c(i).
[Maximum mark: 1]
22M.2.hl.TZ2.c(i)

Sulfur trioxide is produced from sulfur dioxide.

2SO2 (g) + O2 (g) ⇌ 2SO3 (g)          ΔH = −196 kJ mol−1

Draw the Lewis structure of SO3.

[1]

Markscheme

✔

 

Note:

Accept any of the above structures as formal charge is not being assessed.

Examiners report

Drawing the Lewis structure of SO3 proved to be challenging, with lots of incorrect shapes, lone pair on S, etc.; accepting all resonant structures allowed many candidates to get the mark which was fair considering no formal charge estimation was required.

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