DP Chemistry (last assessment 2024)
Question 18M.2.hl.TZ2.5c
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.2.hl.TZ2.5c |
| Level | hl | Paper | 2 | Time zone | TZ2 |
| Command term | Calculate | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 1]
18M.2.hl.TZ2.5c
Enthalpy changes depend on the number and type of bonds broken and formed.
(c)
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]
