DP Chemistry (last assessment 2024)
Question 23M.1.HL.TZ1.14
| Date | May 2023 | Marks available | [Maximum mark: 1] | Reference code | 23M.1.HL.TZ1.14 |
| Level | HL | Paper | 1 | Time zone | TZ1 |
| Command term | Question number | 14 | Adapted from | N/A |
14.
[Maximum mark: 1]
23M.1.HL.TZ1.14
What is the enthalpy change for the following reaction?
CH4 (g) + H2O (g) → CO (g) + 3H2 (g)
| Reaction | ΔH⦵ |
| 2C(graphite) + O2 (g) → 2CO (g) | −222 kJ mol−1 |
| C(graphite) + 2H2 (g) → CH4 (g) | −74 kJ mol−1 |
| 2H2 (g) + O2 (g) → 2H2O (g) | −484 kJ mol−1 |
A. −74 − 242 + 111
B. +74 + 242 − 111
C. −74 − 484 − 222
D. +74 + 484 − 222
[1]
Markscheme
B