DP Chemistry (last assessment 2024)

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Question 19M.2.hl.TZ1.f(ii)

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.hl.TZ1.f(ii)
Level hl Paper 2 Time zone TZ1
Command term Calculate Question number f(ii) Adapted from N/A
f(ii).
[Maximum mark: 1]
19M.2.hl.TZ1.f(ii)

This question is about iron.

Calculate ΔGθ, in kJ, for the spontaneous reaction in (f)(i), using sections 1 and 2 of the data booklet.

[1]

Markscheme

«ΔGθ = −nFEθ = −2mol × 96 500 C mol−1 ×  0.79  J  C − 1 1000 =» −152 «kJ»    [✔]

 

Note: Accept range 150−153 kJ.

Examiners report

Average performance; typical errors were using the incorrect value for n, the number of electrons, or not using consistent units and making a factor of 1000 error in the final answer.

Syllabus sections