Heats of Combustion

Combustion of Alkanes

• Heats of Combustion
  • All alkanes burn in air to give carbon dioxide and water
  • Heat of combustion is quantity of heat produced when one mole of a compound is burned to carbon dioxide and water
    • One mole = 6.02 x 10²³ molecules of substance
    • Heats of combustion increase with increasing number of carbons

Heats of Combustion

Stoichiometric formulas

• Stoichiometric is not an imported vodka
• Describes correct mixture of ingredients in a chemical reaction
• After the reaction is over, no surplus ingredients will be left
• In combustion, the stoichiometric ratio also is called the correct, ideal or perfect ratio:
  CH₄ + 2O₂ CO₂ + 2 H₂O