Born Harber cycle

• What is the chemical reaction for the formation of NaCl?

  Na(s) + 1/2Cl2(g) --> NaCl(s)
• What does the reaction Na(s) + 1/2Cl2(g) --> Na(g) + 1/2Cl2(g) represent?

  It represents the enthalpy of atomisation of Na (∆Ha(Na)).
• What does the reaction Na(g) + 1/2Cl2(g) --> Na(g) + Cl(g) represent?

  It represents the enthalpy of atomisation of Cl (∆Ha(Cl)).
• What does the reaction Na(g) + Cl(g) --> Na+(g) + Cl(g) + e- represent?

  It represents the ionisation energy of Na (IE).
• What does the reaction Na+(g) + Cl(g) + e- --> Na+(g) + Cl-(g) represent?

  It represents the electron affinity of Cl (EA).
• What does the reaction Na+(g) + Cl-(g) --> NaCl(s) represent?

  It represents the lattice formation energy (∆HLf).
• Label the Born Haber cycle of NaCl

  A) Enthalpy of formation

  B) Atomisation of Na

  C) Atomisation of chlorine

  D) Ionisation energy

  E) Electron affinity

  F) Enthalpy of lattice formation