The mole and reacting quantities: n = m/M, n = N/N(A), the Law of Conservation of Mass and simple stoichiometry

What this note covers

1. Why the mole is the hub of Section E
2. The mole and Avogadro's number: n = N/N(A)
3. Molar mass and n = m/M
4. The Law of Conservation of Mass and balanced equations
5. Simple stoichiometry: the mole-ratio road map
6. Laying out a calculation so it earns every mark
7. The problem shapes Section E uses and how to spot them
8. How Section E examines this — and what separates a top answer

8 sections · 12 key terms & formulas · 6 common mistakes