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Topic Notes · Easy summaries with diagrams
Chapter 4 — Chapter 4 — Stoichiometry
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📘Easy summary
Stoichiometry calculates amounts of reactants and products using a balanced equation; it rests on the law of conservation of mass. Elements are shown by symbols (Na, Fe) or molecular formulas (O₂, O₃). Ionic compounds are shown by formula units (NaCl); covalent compounds by molecular formulas (H₂O, NH₃, CH₄).
⭐Key points
- Stoichiometric coefficients give the mole ratio.
- Industry uses stoichiometry for raw-material amounts.
- Molecular formula shows all types and numbers of atoms in one molecule.
🔬Diagram
🌿Real-life example
Ozone O₃ has three oxygen atoms bonded together.
💡Exam tip
- Total mass of reactants = total mass of products.
✅Quick check
1. NaCl is represented by a:
2. Stoichiometry is based on:
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