DP Chemistry (last assessment 2024)

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Question 22N.2.sl.TZ0.a

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Date November 2022 Marks available [Maximum mark: 2] Reference code 22N.2.sl.TZ0.a
Level sl Paper 2 Time zone TZ0
Command term Calculate Question number a Adapted from N/A
a.
[Maximum mark: 2]
22N.2.sl.TZ0.a

Lignite, a type of coal, contains about 0.40 % sulfur by mass.

Calculate the amount, in mol, of sulfur dioxide produced when 500.0 g of lignite undergoes combustion.

S (s) + O2 (g) → SO2 (g)

[2]

Markscheme

«0.40%×500.0 g=» 2.0 «g» ✔

«2.0 g×1 mol S32.07 g=0.062 mol of S» = 0.062 «mol of SO2» ✔

 

Award [2] for correct final answer.

Accept 0.063 «mol».

Examiners report

A question that discriminated well between high-achieving and low-achieving candidates. The majority of the candidates were able to achieve one mark for determining the number of moles using 500g, while stronger candidates determined 0.40% of 500g to determine the correct number of moles. A number of candidates had a power of ten error in the first step.

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