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Homework Help: Chemistry-Born Haber Cycle(pls help )

  1. Jan 6, 2009 #1
    Chemistry-Born Haber Cycle(pls help!!)

    We are meant to find the enthalpy of atomisation of chlorine by doing the born haber cycle for NaCl. The values given are:
    First ionisation energy of sodium: +496 kJmol-
    Enthalpy change of atomisation of sodium: +108 kJmol-
    Electron affinity of chlorine: -348 kJmol-
    Enthalpy change of formation of NaCl (s): -411 kJmol-
    Lattice enthalpy of NaCl: -784 kJmol-

    I tried to set up the cycle and work it out but my answer keeps coming negative when atomisation should always be positive!! I don't know what I'm doing wrong, please help me out!!!

  2. jcsd
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