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Homework Help: Enthalpy change & lattice energy - check please

  1. Nov 10, 2005 #1
    Write the reaction where the enthalpy change is the lattice energy for silver floride. Make sure you include the physical states.

    Ag F (ag) yields Ag Positive(g) + F negative(g)

    Could you please check this
    Could you help with this one: write the equation for the reaction where the enthalpy change represents the lattice energy of iron (III) chloride (FeCl3) Do not forget to include the physical states. Could you get me started?
  2. jcsd
  3. Nov 11, 2005 #2


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    This is almost correct, but what is "(ag)" ?
    This is just like the other problem. First break up the molecule into individual atoms (FeCl3 breaks up into an Fe atom and 3 Cl atoms). Next you put the correct charges on these atoms to convert them to the appropriate ions. So Fe should be Fe(3+), and each Cl would be... ?
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