DP Chemistry (last assessment 2024)
Question 22M.2.hl.TZ2.4d(iii)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.hl.TZ2.4d(iii) |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | Calculate | Question number | d(iii) | Adapted from | N/A |
d(iii).
[Maximum mark: 1]
22M.2.hl.TZ2.4d(iii)
Hydrogen and iodine react to form hydrogen iodide.
H2 (g) + 2 (g) 2H (g)
Consider the reaction of hydrogen with solid iodine.
H2 (g) + 2 (s) 2H (g) ΔH⦵ = +53.0 kJ mol−1
(d(iii))
Calculate the Gibbs free energy change, ΔG⦵, in kJ mol−1, for the reaction at 298 K. Use section 1 of the data booklet.
[1]
Markscheme
«ΔG⦵ = 53.0 kJ mol–1 – (298K × 0.1665 kJ K–1 mol–1) =» 3.4 «kJ mol–1» ✔
