| Date | May 2018 | Marks available | 3 | Reference code | 18M.3.sl.TZ1.5 |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Determine | Question number | 5 | Adapted from | N/A |
Question
Aluminium is produced by the electrolysis of a molten electrolyte containing bauxite.
Determine the mass, in g, of aluminium produced by the passage of a charge of 1.296 × 1013 C. Use sections 2 and 6 of the data booklet.
Markscheme
ratio of electrons : aluminium ions = 3 : 1
amount Al «\(\frac{{1.296 \times {{10}^{13}}{\text{ C}}}}{{96500{\text{ C mo}}{{\text{l}}^{ - 1}} \times 3}}\) » = 4.48 × 107 «mol»
mass Al «= 4.48 × 107 mol × 26.98 g mol–1» = 1.21 × 109 «g»
Award [3] for correct final answer.
[3 marks]
Examiners report
[N/A]
