Intuitional
← Back to blog
O Level

O-Level Pure Chemistry: Mole Concept & Stoichiometry: Step-by-Step

•By Intuitional Team•1 min read

O-Level Pure Chemistry — Mole Concept & Stoichiometry: Step-by-Step: quick notes, common traps, and an exam-style example.

O-Level Pure Chemistry: Mole Concept & Stoichiometry: Step-by-Step

Mole concept

1 mol = 6.02 × 10²³ particles. n = m/Mr or n = V/24 dm³ (for gases at rtp).

Stoichiometry

Use balanced equations to get molar ratios. Always work in moles before converting to mass/volume.

Exam habits

  • Always show mole ratio step.
  • Convert cm³ to dm³ for gas volumes.
  • Box final answer with correct units.
#O-Level#Pure Chemistry#Mole Concept & Stoichiometry
Share this article
Share on TwitterShare on FacebookShare on LinkedIn

Keep reading

O Level

O-Level Pure Chemistry: Energy Changes — Exothermic vs. Endothermic Reactions

Master the fundamentals of energy changes in O-Level Pure Chemistry. Learn the key differences between exothermic and endothermic reactions, bond breaking vs. bond forming, and energy profile diagrams.

Read →O Level

O-Level Pure Chemistry: Periodic Table Trends & Mastery

Master the atomic trends and chemical properties of Group I, Group VII, and Noble Gases. Essential notes for O-Level Pure Chemistry exams.

Read →O Level

O-Level Elementary Mathematics: Indices & Standard Form: Speed Drills

O-Level Elementary Mathematics — Indices & Standard Form: Speed Drills: quick notes, common traps, and an exam-style example.

Read →