DP Chemistry (last assessment 2024)

Question 22N.2.hl.TZ0.b

Date	November 2022	Marks available	[Maximum mark: 1]	Reference code	22N.2.hl.TZ0.b
Level	hl	Paper	2	Time zone	TZ0
Command term	Show	Question number	b	Adapted from	N/A

[Maximum mark: 1]

22N.2.hl.TZ0.b

Consider the following reaction:

Cu²⁺ (aq) + Fe (s) → Fe²⁺(aq) + Cu (s)

The mass spectrum for copper is shown:

^{Source: WebElements, n.d. Copper: isotope data [online] Available at:}
^{https://www.webelements.com/copper/isotopes.html [Accessed 6 October 2021].}

Show how a relative atomic mass of copper of 63.62 can be obtained from this mass spectrum.

[1]

Markscheme

$\frac{(63 \times 69) + (65 \times 31)}{100}$

$65 x + (1 - x) 63 = 63.62$ AND $x = 0.31 / 31$ «%» AND $1 - x = 0.69 / 69$ «%» ✔

Examiners report

Almost every student managed to illustrate how isotopic abundances, from the given mass spectrum, could be used to calculate the relative atomic mass of the element.

Syllabus sections

Core

Core » Topic 2: Atomic structure » 2.1 The nuclear atom

Core » Topic 2: Atomic structure

Question 22N.2.hl.TZ0.b

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