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Question 18N.2.hl.TZ0.3d.iii

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.2.hl.TZ0.3d.iii
Level hl Paper 2 Time zone TZ0
Command term Calculate Question number d.iii Adapted from N/A
d.iii.
[Maximum mark: 2]
18N.2.hl.TZ0.3d.iii

Bromine can form the bromate(V) ion, BrO3−.

(d.iii)

Calculate the standard Gibbs free energy change, ΔGΘ, in J, of the redox reaction in (ii), using sections 1 and 24 of the data booklet.

EΘ (BrO3− / Br−) = +1.44 V

 

[2]

Markscheme

EΘreaction = «+1.44 V – 0.77 V =» 0.67 «V» ✔

ΔGΘ = «–nFEΘreaction = – 6 × 96500 C mol–1 × 0.67 V =» –3.9 × 105 «J» ✔

 

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