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Tuesday, May 31, 2011

Chemical energetics (Section 1 of 2)

The Born Haber Cycle
What is the Born Haber Cycle?
The born Haber cycle can be used to determine lattice enthalpy of a compound. In the born Haber cycle every step from the elements to the ionic compound can be measured experimentally except the lattice enthalpy which therefore can be calculated using the Hess's law

What is Lattice enthalpy?
Lattice enhalpy is the energy change that occurs when 1 mole of an ionic compound is formed from its gaseous ions under standard conditions (1 atm Pressure and 298 K Temperature)
The Born Haber Cycle of NaCl
Some terms used in the following slides:
  • ΔH atomization: The energy change(enthalpy change) that occurs when one mole of gaseous atoms are formed from an element in its standard state
  • ΔH First electron affinity: The enthalpy change that occurs when one electron is added to each gaseous atom to form one mole of 1- gaseous ions.
















    Video explanation of the above cycle

















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