DP Chemistry (first assessment 2025)

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Question SPM.1A.HL.TZ0.21

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Date May Specimen-2023 Marks available [Maximum mark: 1] Reference code SPM.1A.HL.TZ0.21
Level HL Paper 1A Time zone TZ0
Command term Question number 21 Adapted from N/A
21.
[Maximum mark: 1]
SPM.1A.HL.TZ0.21

What is the enthalpy change for the reaction in kJ mol−1?

CO2 (g) + H2 (g) → CO (g) + H2O (g)

2CO (g) + O2 (g) → 2CO2 (g)       ΔH = -566 kJ mol-1

2H2 (g) + O2 (g) → 2H2O (l)       ΔH = -572 kJ mol-1

H2O (g) → H2O (l)                   ΔH = -44 kJ mol-1


A.  -1182

B.  -899

C.  -41

D.  +41

[1]

Markscheme

D