Stoichiometry

• Reaction Stoichiometry

  Calculations based on chemical equations
• The Mole

  A measure of the amount of substance, 6.022 x 10^23 particles/mol (Avogadro's number)
• One mole (1 mol) contains 6.022 x 10^23 entities or particles (to four significant figures)
• Molar Mass

  Mass in grams numerically equal to the atomic weight of the element, has a unit of g/mol
• Determining the Molar Mass


  Calculate the formula weight of a compound
• Mass - Mole - Particle Conversion

  Use dimensional analysis to convert between mass, moles, and number of particles
• Reaction Stoichiometry

  1. Calculations based on chemical equations

  2. How much product is formed

  3. How much of one substance reacts with another

  4. How much reactant is left after reaction
• Stoichiometric Factors

  • Relating reactants to each other
  • Relating reactants to products
• Limiting Reactant


  The reactant which is completely consumed in the reaction and gives the smallest amount of product
• Identifying Limiting and Excess Reactants

  1. Step 1: Balance equation

  2. Step 2: Convert moles of reactants to moles of product

  3. Step 3: The smaller value is the limiting reactant
• Mole Ratio


  The ratio of the amount of moles of a reactant or product in a chemical reaction.
• What is the mole ratio?


  The ratio of the amount of moles of a reactant or product in a chemical reaction.
• Mole Ratio formula


  Reactant A (mol) / Reactant B (mol) = Mole ratio (mol/mol)
• What is the difference between mole ratio and conversion factor?

  Mole ratio is the ratio of amount of moles in a reaction, while conversion factor is a ratio used to convert between amounts of different substances.