Enthalpy change

• Define standard enthalpy of formation

  Standard enthalpy change when 1 mole of a compound is formed from its elements in their standard states under standard conditions
• Define standard enthalpy of combustion

  The enthalpy change when 1 mole of substance is completely burned in oxygen under standard conditions
• Define bond enthalpy

  The energy required to break one mole of gaseous bonds to form gaseous atoms
• How is enthalpy change for a reaction measured?

  By measuring temperature change