Relative mass, molar mass and mass-mole-particle conversions
Move among mass, moles and particle count while preserving formula composition and units
Learn free: The mole connects a balance to particlesChemistry → Senior Secondary / GCSE / IGCSE / HS → Mole Concept & Stoichiometry
Percentage yield, purity and atom economy
LESSON IN PREPARATIONDistinguish yield, purity and process-efficiency measures and use the appropriate base quantity
Start with the right foundation.
- stoichiometric theoretical yield
- percentages
Curriculum context: Atom economy tagged where specified · Global / exact-fit
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Stoichiometric reacting masses and mole ratios
Use a balanced equation as a mole-ratio map to calculate reacting/product masses and amounts
The mole and Avogadro constant
Use the mole as the bridge between microscopic entity count and macroscopic amount
Gas volumes and gaseous stoichiometry
Relate gas volume to amount at explicitly stated conditions and combine with balanced-equation ratios
Empirical formula, molecular formula and percentage composition
Infer simplest/molecular composition from mass or percentage evidence and connect formula to quantitative composition
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