DP Chemistry (last assessment 2024)
Question 17N.2.hl.TZ0.5a
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.2.hl.TZ0.5a |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | Calculate | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
17N.2.hl.TZ0.5a
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)
(a)
Calculate the standard enthalpy change for this reaction using the following data.
[2]
Markscheme
ΔHθ = [–165.2 + 2(–296.9) + 2(–92.3)] – [–454.7 + 2(–245.7)]
«ΔHθ = +»2.5 «kJ»
Award [2] for correct final answer.
Award [1] for –2.5 «kJ».
Do not accept ECF for M2 if more than one error in M1.
