Standard enthalpy change

Standard enthalpy change

1. Enthalpy change of formation

   • 1 mole of a compound is formed from its constituent elements in their standard states under standard conditions
   • = products - reactants

2. Enthalpy change of combustion

   • 1 moles of a substance reacts completely with oxygen under standard conditions, all reactants and products being in their standard states
   • n=mass/molecular mass

3. Standard conditions

   • 1 atmosphere
   • -298K
   • Concentration of 1moldm^-3

4. Enthalpy change of reaction

   • The enthalpy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions, all reactants and products being in their standard states

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