Stoichometry

• It answers the questions: How much product will be produced from a given amount of reactant? How much reactant is needed to produce a specific amount of a particular compound?
• Stoichiometry


  The measure of elements
• Mole method


  The stoichiometric coefficients in a chemical equation can be interpreted as the number of moles of each substance
• Mole to Mole


  • Mole A ⟶ Mole B
  • mole ratio
• Mole to Mass


  • Mole A ⟶ Mole B ⟶ Mass B
  • mole ratio
• Mass to Mass


  • Mass A ⟶ Mole A ⟶ Mole B ⟶ Mass B
  • mole ratio
• Variables


  • nA → Mole A (mol)
  • nB → Mole B (mol)
  • mA → Mass A (g)
  • mB→ Mass B (g)
  • MA → Molar Mass A (g/mol)
  • MB→ Molar Mass B (g/mol)
  • mole ratio → Mole A : Mole B or Mole B : Mole A (mol)
• Do not assume that mass or mole A is always the reactant and mass or mole B is always the product. These variables depend on the situation, so read the word problem carefully.
• Whichever compound has a given quantity in the problem, that is always the A, and the unknown quantity is always the B.
• Before doing a stoichiometric conversion, write the balanced chemical equation first based on the given problem.
• Stoichiometry


  • The quantitative study of the relationships between reactants and products in a chemical reaction
  • Moles (n) are used to calculate the amount of product formed in a reaction
  • Mole method - The stoichiometric coefficients in a chemical equation can be interpreted as the number of moles of each substance