DP Chemistry (first assessment 2025)

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Question 19N.1A.SL.TZ0.15

Date	November 2019	Marks available	[Maximum mark: 1]	Reference code	19N.1A.SL.TZ0.15
Level	SL	Paper	1A	Time zone	TZ0
Command term	Apply	Question number	15	Adapted from	N/A

15.

[Maximum mark: 1]

19N.1A.SL.TZ0.15

What is the enthalpy change of the reaction?

C₆H₁₄ (l) → C₂H₄ (g) + C₄H₁₀ (g)

A. + 1411 + 2878 + 4163

B. + 1411 − 2878 − 4163

C. + 1411 + 2878 − 4163

D. − 1411 − 2878 + 4163

[1]

Markscheme

C

Syllabus sections

Reactivity 1. What drives chemical reactions? » Reactivity 1.2—Energy cycles in reactions » Reactivity 1.2.2—Hess’s law states that the enthalpy change for a reaction is independent of the pathway between the initial and final states. Apply Hess’s law to calculate enthalpy changes in multistep reactions.