H2 Chemistry Notes: CORE IDEA 3, Topic 6 - Mole Concept and Stoichiometry

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11 Feb 2025, 00:00 Z

Q: What does H2 Chemistry Notes: CORE IDEA 3, Topic 6 - Mole Concept and Stoichiometry cover? A: Build systematic problem-solving routines for mole calculations, limiting reagents, redox titrations, and analytical stoichiometry in Core Idea 3 (Mole Concept and Stoichiometry).

Stoichiometry underpins quantitative chemistry-from gas calculations to titration analysis. This note structures the workflow and highlights the must-know techniques for Paper 2 and Paper 3.

Pair it with the broader revision plan available at https://eclatinstitute.sg/blog/h2-chemistry-notes.

1 Fundamental Relationships

Formula	Description
$n = \dfrac{m}{M}$	Moles from mass and molar mass.
$n = CV$	Moles from concentration $C$ ($\pu{mol.L-1}$) and volume $V$ ($\pu{L}$).
$n = \dfrac{V}{V_m}$	Moles from gas volume $V$ and molar volume $V_m = \pu{24.0 dm3.mol-1}$ at $\pu{298 K}$ and $\pu{1.01e5 Pa}$.

Always state units. If conditions differ from RTP, revert to the ideal gas equation $PV = nRT$ .

Formula	Description
\(n = \dfrac{m}{M}\)	Moles from mass and molar mass.
\(n = CV\)	Moles from concentration \(C\) (\(\pu{mol.L-1}\)) and volume \(V\) (\(\pu{L}\)).
\(n = \dfrac{V}{V_m}\)	Moles from gas volume \(V\) and molar volume \(V_m = \pu{24.0 dm3.mol-1}\) at \(\pu{298 K}\) and \(\pu{1.01e5 Pa}\).

H2 Chemistry Notes: CORE IDEA 3, Topic 6 - Mole Concept and Stoichiometry

1 Fundamental Relationships

2 Stoichiometric Method

2.1 Limiting Reagent Logic

3 Percentage Yield and Purity

4 Redox and Acid-Base Titrations

4.1 Typical Workflow

4.2 Common Redox Equations

5 Empirical and Molecular Formulae

6 Worked Example

7 Practical Tips

8 Common Mistakes

9 Quick Drills

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