DP Chemistry (first assessment 2025)

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Question 21N.1A.SL.TZ0.1

Date	November 2021	Marks available	[Maximum mark: 1]	Reference code	21N.1A.SL.TZ0.1
Level	SL	Paper	1A	Time zone	TZ0
Command term	Solve	Question number	1	Adapted from	N/A

1.

[Maximum mark: 1]

21N.1A.SL.TZ0.1

How much ethanol contains 1.20 × 10²⁴ atoms of carbon?

Avogadro’s constant, L or N_A: 6.02 × 10²³mol⁻¹

A. 0.333 mol

B. 0.500 mol

C. 1.00 mol

D. 2.00 mol

[1]

Markscheme

C

Syllabus sections

Structure 1. Models of the particulate nature of matter » Structure 1.4—Counting particles by mass: The mole » Structure 1.4.1—The mole (mol) is the SI unit of amount of substance. One mole contains exactly the number of elementary entities given by the Avogadro constant. Convert the amount of substance, n, to the number of specified elementary entities.