DP Chemistry (last assessment 2024)
Question 18M.2.hl.TZ2.c
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.2.hl.TZ2.c |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | Calculate | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 1]
18M.2.hl.TZ2.c
Enthalpy changes depend on the number and type of bonds broken and formed.
The table lists standard entropy, SΘ, values.
Calculate the standard entropy change for the reaction, ΔSΘ, in J K−1.
CH4(g) + H2O(g) → 3H2(g) + CO(g)
[1]
Markscheme
«ΔSΘ = ΣSΘproducts – ΣSΘreactants = 198 + 3 × 131 – (186 + 189) =» «+» 216 «J K–1»
[1 mark]
