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Enthalpy Change

  • when heat is given out to surroundings, the reaction is exothermic
  • when heat is taken in from the surroundings, the reaction is endothermic
  • elements in standard state if they are in their normal state at 298K and 100kPa
  • standard enthalpy of combustion - enthalpy change when 1 mole of a compoiund completely burns in oxygen under standard conditions, all reactants and products in their standard states
  • standard enthalpy of formation - enthalpy change when 1 mole of a compoiund is formed from its constituent elements in their standard states, under standard conditions
  • the heat energy required to change a substance's temperature by a certain amount, is expressed by:
    • Q = mass x specific heat capacity x change in temperature
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