DP Chemistry (last assessment 2024)

Question 20N.1.sl.TZ0.13

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1.sl.TZ0.13
Level	sl	Paper	1	Time zone	TZ0
Command term	State	Question number	13	Adapted from	N/A

13.

[Maximum mark: 1]

20N.1.sl.TZ0.13

Which equation shows the enthalpy of formation, $∆ H_{f}$ , of ethanol?

A. $2 C (s) + 3 H_{2} (g) + \frac{1}{2} O_{2} (g) \to C_{2} H_{5} OH (g)$

B. $4 C (s) + 6 H_{2} (g) + O_{2} (g) \to 2 C_{2} H_{5} OH (g)$

C. $2 C (s) + 3 H_{2} (g) + \frac{1}{2} O_{2} (g) \to C_{2} H_{5} OH (l)$

D. $4 C (s) + 6 H_{2} (g) + O_{2} (g) \to 2 C_{2} H_{5} OH (l)$

[1]

Markscheme

Examiners report

Less than half of the candidates selected the correct equation for the enthalpy of formation of ethanol. The most common wrong answer involved ethanol formed as a gas.

Syllabus sections

Core

Core » Topic 5: Energetics/thermochemistry » 5.2 Hess’s Law

Core » Topic 5: Energetics/thermochemistry

Question 20N.1.sl.TZ0.13

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