DP Chemistry (last assessment 2024)

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Question 22M.2.sl.TZ1.b(i)

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.sl.TZ1.b(i)
Level sl Paper 2 Time zone TZ1
Command term Calculate Question number b(i) Adapted from N/A
b(i).
[Maximum mark: 1]
22M.2.sl.TZ1.b(i)

When heated in air, magnesium ribbon reacts with oxygen to form magnesium oxide.

The reaction in (a)(i) was carried out in a crucible with a lid and the following data was recorded:

Mass of crucible and lid = 47.372 ±0.001 g

Mass of crucible, lid and magnesium ribbon before heating = 53.726 ±0.001 g

Mass of crucible, lid and product after heating = 56.941 ±0.001 g

 

Calculate the amount of magnesium, in mol, that was used.

[1]

Markscheme

⟨⟨53.726 g-47.372 g244.31 g mol-1=6.354 g24.31 g mol-1⟩⟩=0.2614  «mol» ✔

Examiners report

A number of students were not able to interpret the results and hence find the gain in mass and calculate the moles correctly.

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