• Enthalpy  is the heat content of a system at constant pressure.
  • It is determined by the energies needed to break chemical bonds and to form chemical bonds.
  • Enthalpy is an extensive property, determined in part by the amount of material we work with.
  • The state of reactants and products (solid, liquid, or gas) influences the enthalpy value for a system.
  • The direction of the reaction affects the ent Halpy value.
  • A reaction that takes place in the opposite direction has the same numerical entHalpy value but the opposite sign.
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