DP Chemistry (last assessment 2024)
Question 22M.2.hl.TZ2.d(i)
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.hl.TZ2.d(i) |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | Calculate | Question number | d(i) | Adapted from | N/A |
d(i).
[Maximum mark: 1]
22M.2.hl.TZ2.d(i)
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
Calculate the entropy change of reaction, ΔS⦵, in J K−1 mol−1.
[1]
Markscheme
«Δ = 2 × 206.6 – (130.6 + 116.1) =» 166.5 «J K–1 mol–1» ✔
Examiners report
ΔS was well calculated in general except for some inverted calculations or failure to consider the ratios of the reactants.
