Stoichiometry and Dimensional Analysis

Definition of Stoichiometry

  • Uses relationships between reactants and products to:

    1. Determine product outcomes.

    2. Calculate required reactants for desired product amounts.

Important Relationships

  • Mole Definition: Measure of amount in chemistry.

  • Molar Mass: Mass of one mole of a substance.

  • Mole Ratio: Coefficients in balanced equations indicate mole ratios.

Dimensional Analysis Reminder

  • Conversion of units through designated factors to arrive at correct outcomes.

    • General formula: Units you cancel / Units you want = Units you want / Units you cancel.

Mole Ratios from Balanced Equations

  • Coefficients indicate relationships: e.g. 2 mol H2 : 1 mol O2.

Statements from Chemical Reactions

  • Analyze chemical reactions to derive quantities and relationships.

    • Example Reaction: CH4 + 2O2 → CO2 + 2H2O

    • Derived Statements:

    1. Mole to Mole relationships.

    2. Moles to Particles using 6.02 \times 10^{23}.

    3. Mass relationships obeying the Law of Conservation of Matter.

Stoichiometry Map for Calculations

  • Map outlines conversion paths: mass/amounts of reactants/products.

  • Navigate between moles and mass through mole ratios derived from balanced equations.