DP Chemistry (last assessment 2024)
Question 19M.1.hl.TZ1.15
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1.hl.TZ1.15 |
| Level | hl | Paper | 1 | Time zone | TZ1 |
| Command term | Question number | 15 | Adapted from | N/A |
15.
[Maximum mark: 1]
19M.1.hl.TZ1.15
What is the enthalpy change of reaction for the following equation?
C2H4 (g) + H2 (g) → C2H6 (g)
C2H4 (g) + 3O2 (g) → 2CO2 (g) + 2H2O (l) ΔH = x
C2H6 (g) + O2 (g) → 2CO2 (g) + 3H2O (l) ΔH = y
H2 (g) + O2 (g) → H2O (l) ΔH = z
A. x + y + z
B. −x − y + z
C. x − y − z
D. x − y + z
[1]
Markscheme
D
Examiners report
Nearly 89 % of candidates answered this Hess Law question correctly. This topic was obviously well covered.