DP Chemistry (last assessment 2024)

Question 18N.2.hl.TZ0.2a

Date	November 2018	Marks available	[Maximum mark: 3]	Reference code	18N.2.hl.TZ0.2a
Level	hl	Paper	2	Time zone	TZ0
Command term	Determine	Question number	a	Adapted from	N/A

[Maximum mark: 3]

18N.2.hl.TZ0.2a

An organic compound containing carbon, hydrogen and oxygen has 62.02 % carbon and 10.43 % hydrogen by mass.

(a)

Determine the empirical formula of the compound, showing your working.

[3]

Markscheme

«in 100 g sample» $\frac{{62.02\,{\text{g}}}}{{12.01\,{\text{g}}\,{\text{mo}}{{\text{l}}^{ - 1}}}}$ AND $\frac{{10.43\,{\text{g}}}}{{1.01\,{\text{g}}\,{\text{mo}}{{\text{l}}^{ - 1}}}}$

«in 100 g sample» 5.164 mol C AND 10.33 mol H ✔

27.55 %

1.722 mol O ✔

«empirical formula» C₃H₆O ✔

Syllabus sections

Core

Core » Topic 1: Stoichiometric relationships » 1.2 The mole concept

Core » Topic 1: Stoichiometric relationships

Question 18N.2.hl.TZ0.2a

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