DP Chemistry (last assessment 2024)
Question 22M.2.hl.TZ1.c(i)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.hl.TZ1.c(i) |
| Level | hl | Paper | 2 | Time zone | TZ1 |
| Command term | Justify, State | Question number | c(i) | Adapted from | N/A |
c(i).
[Maximum mark: 1]
22M.2.hl.TZ1.c(i)
Ammonia is produced by the Haber–Bosch process which involves the equilibrium:
N2 (g) + 3 H2 (g) 2 NH3 (g)
The percentage of ammonia at equilibrium under various conditions is shown:
[The Haber Bosch Process [graph] Available at: https://commons.wikimedia.org/wiki/File:Ammonia_yield.png
[Accessed: 16/07/2022].]
The standard free energy change, ΔG⦵, for the Haber–Bosch process is –33.0 kJ at 298 K.
State, giving a reason, whether the reaction is spontaneous or not at 298 K.
[1]
Markscheme
spontaneous AND ΔG < 0 ✔
Examiners report
Reason for the reaction being spontaneous was generally very done well indeed.
