IB Chemistry SL 1.4.1 The Mole and Particle Counts

Practise using the mole as a bridge between a measurable amount of substance and its microscopic entities. Convert mass to amount when needed, multiply by Avogadro's constant and…

Syllabus
First assessment 2025
Objective
1.4.1
Level
SL

Exam points

  • convert a given amount to entities by multiplying by Avogadro's constant
  • use molar mass to move from sample mass to moles before counting particles
  • multiply by the formula subscript to count a specified atom or ion in each formula unit

1.4.1—Mole (mol) question 1

[Maximum number: 1]

How many ions are present in 0.20 mol of (NH4)2SO4\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} ?

A

0.20×1×6×10230.20 \times 1 \times 6 \times 10^{23}

B

0.20×2×6×10230.20 \times 2 \times 6 \times 10^{23}

C

0.20×3×6×10230.20 \times 3 \times 6 \times 10^{23}

D

0.20×7×6×10230.20 \times 7 \times 6 \times 10^{23}

All question bank results loaded