Borne Haber Cycle/ Lattice Enthalpy for KBr

  1. 1. The problem statement, all variables and given/known data

    Draw the Borne Haber cycle for KBr

    2. Relevant equations



    3. The attempt at a solution

    so the energy required to make the K into gas is +89kJ/mol
    and it takes +420kJ/mol to take 1 electron from K

    it takes +112kJ/mol to make Br a gas
    it takes -342kJ/mol to give the Br an electron

    and i was given -392 delta H subscrpit F superscript theta = -392kJ/mol (what does this mean?)

    how do i calculate the lattice enthalpy?

    Using Hess's law it should be the sum
    So is it
    89+420+112-342-392???
     
  2. jcsd
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