Stoichiometry Mastery

Deep practice on moles, molar mass, mole ratios, limiting reactants, yields, and formula determination.

Intended learner

Learners who can balance equations and need quantitative fluency.

Prerequisites

• chemical-reactions-equations
• chemical-names-formulas

Outcomes

• Convert grams, moles, and particles fluently
• Apply mole ratios correctly
• Identify limiting reactant without error
• Determine empirical and molecular formulas

Ordered modules

1. Mole Foundations

• mole avogadro
• molar mass
• grams moles particles

2. Reaction Stoichiometry

• mole ratios stoichiometry
• limiting excess reactants
• theoretical actual percent yield

3. Formula & Composition

• empirical molecular formulas
• percent composition

4. Solutions Extension

Molarity builds on stoichiometry

• molarity
• molality
• preparation dilution

Estimated time

~14 hours. Progress is stored locally; completion is self-reported.

Completion rules

Weighted practice: 80% correct on mastery set. Retry allowed; no penalty.

Related topics

• mole-stoichiometry
• solutions-concentration

Review

• Last reviewed: 2026-08-21
• Review due: 2027-08-21
• Author: Chemistry Fundamentals Editorial Team
• Reviewer: Dr. Example Reviewer (PhD Chemistry — placeholder reviewer)
• Sources: NIST 2022-CODATA via nist-2022.

Curriculum note

Frameworks are stored separately in src/content/curriculum/ with framework name, version/year, standard ID, and source URL. No official affiliation is implied.