DP Chemistry (last assessment 2024)
Question 17N.2.hl.TZ0.5b
| Date | November 2017 | Marks available | [Maximum mark: 1] | Reference code | 17N.2.hl.TZ0.5b |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Calculate | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
17N.2.hl.TZ0.5b
Ethane-1,2-diol, HOCH2CH2OH, reacts with thionyl chloride, SOCl2, according to the reaction below.
HOCH2CH2OH (l) + 2SOCl2 (l) → ClCH2CH2Cl (l) + 2SO2 (g) + 2HCl (g)
(b)
Calculate the standard entropy change for this reaction using the following data.
[1]
Markscheme
«ΔSθ = [208.5 + 2(248.1) + 2(186.8)] – [166.9 + 2(278.6)]»
«ΔSθ = +» 354.2 «J K–1 mol–1»
