DP Chemistry (last assessment 2024)
Question 18M.2.sl.TZ1.3b.ii
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.2.sl.TZ1.3b.ii |
| Level | sl | Paper | 2 | Time zone | TZ1 |
| Command term | Determine | Question number | b.ii | Adapted from | N/A |
b.ii.
[Maximum mark: 2]
18M.2.sl.TZ1.3b.ii
This question is about ethene, C2H4, and ethyne, C2H2.
(b.ii)
Determine the standard enthalpy change, ΔHΘ, for the following similar reaction, using ΔHf values in section 12 of the data booklet.
3C2H2(g) → C6H6(l)
[2]
Markscheme
ΔHΘ = ΣΔHf(products) – ΣΔHf(reactants)
«ΔHΘ = 49 kJ – 3 × 228 kJ =» –635 «kJ»
Award [2] for correct final answer.
Award [1 max] for “+635 «kJ»”.
[2 marks]
