DP Chemistry (last assessment 2024)

Question 20N.2.hl.TZ0.d(iii)

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.2.hl.TZ0.d(iii)
Level	hl	Paper	2	Time zone	TZ0
Command term	Calculate	Question number	d(iii)	Adapted from	N/A

d(iii).

[Maximum mark: 1]

20N.2.hl.TZ0.d(iii)

Nickel catalyses the conversion of propanone to propan-2-ol.

Calculate the standard free energy change, $∆ G^{⦵}$ , in $kJ$ , for the cell using sections 1 and 2 of the data booklet.

[1]

Markscheme

$« {ΔG}^{Θ} = - {nFE}^{Θ} = - 2 \times 96 500 \times \frac{0.13}{1000} = » - 25 « k J »$ ✔

Examiners report

This was similar to 2f(ii) where many could apply the formula for Gibbs free energy change, ΔG^ө, correctly however some did not get the units correct.

Syllabus sections

Additional higher level (AHL)

Additional higher level (AHL) » Topic 19: Redox processes » 19.1 Electrochemical cells

Additional higher level (AHL) » Topic 19: Redox processes

Question 20N.2.hl.TZ0.d(iii)

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