DP Chemistry (last assessment 2024)

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Question 19M.2.hl.TZ1.6d

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.hl.TZ1.6d
Level hl Paper 2 Time zone TZ1
Command term Calculate Question number d Adapted from N/A
d.
[Maximum mark: 2]
19M.2.hl.TZ1.6d

This question is about iron.

(d)

Mass spectrometry analysis of a sample of iron gave the following results:

Calculate the relative atomic mass, Ar, of this sample of iron to two decimal places.

[2]

Markscheme

«Ar =» 54 × 0.0584 + 56 × 0.9168 + 57 × 0.0217 + 58 × 0.0031

OR

«Ar =» 55.9111    [✔]

«Ar =» 55.91    [✔]

 

Note: Award [2] for correct final answer


Do not accept data booklet value (55.85).

Examiners report

This question on average atomic mass was the best answered question on the exam. A few candidates did not write the answer to two decimal places as per instructions.

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