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
Empirical formula, molecular formula and percentage composition
LESSON IN PREPARATIONInfer simplest/molecular composition from mass or percentage evidence and connect formula to quantitative composition
Start with the right foundation.
- moles
- molar mass
- ratios
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The mole and Avogadro constant
Use the mole as the bridge between microscopic entity count and macroscopic amount
Stoichiometric reacting masses and mole ratios
Use a balanced equation as a mole-ratio map to calculate reacting/product masses and amounts
Gas volumes and gaseous stoichiometry
Relate gas volume to amount at explicitly stated conditions and combine with balanced-equation ratios
Percentage yield, purity and atom economy
Distinguish yield, purity and process-efficiency measures and use the appropriate base quantity
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