DP Chemistry (first assessment 2025)

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Question 22M.1A.SL.TZ1.4

Date	May 2022	Marks available	[Maximum mark: 1]	Reference code	22M.1A.SL.TZ1.4
Level	SL	Paper	1A	Time zone	TZ1
Command term	Identify	Question number	4	Adapted from	N/A

4.

[Maximum mark: 1]

22M.1A.SL.TZ1.4

8.8 g of an oxide of nitrogen contains 3.2 g of oxygen. What is the empirical formula of the compound?

A. N₂O₅

B. N₂O

C. NO₂

D. NO

[1]

Markscheme

B

Syllabus sections

Structure 1. Models of the particulate nature of matter » Structure 1.4—Counting particles by mass: The mole » Structure 1.4.4—The empirical formula of a compound gives the simplest ratio of atoms of each element present in that compound. The molecular formula gives the actual number of atoms of each element present in a molecule. Interconvert the percentage composition by mass and the empirical formula. Determine the molecular formula of a compound from its empirical formula and molar mass.