DP Chemistry (last assessment 2024)
Question 19N.2.hl.TZ0.6d
| Date | November 2019 | Marks available | [Maximum mark: 2] | Reference code | 19N.2.hl.TZ0.6d |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Apply, Determine | Question number | d | Adapted from | N/A |
d.
[Maximum mark: 2]
19N.2.hl.TZ0.6d
Copper forms two chlorides, copper(I) chloride and copper(II) chloride.
(d)
Determine the enthalpy of solution of copper(II) chloride, using data from sections 18 and 20 of the data booklet.
The enthalpy of hydration of the copper(II) ion is −2161 kJ mol−1.
[2]
Markscheme
enthalpy of solution = lattice enthalpy + enthalpies of hydration «of Cu2+ and Cl−» ✔
«+2824 kJ mol–1 − 2161 kJ mol–1 − 2(359 kJ mol–1) =» −55 «kJ mol–1» ✔
NOTE: Accept enthalpy cycle.
Award [2] for correct final answer.
