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Topic: Secret of Electron Affinity?  (Read 2783 times)

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Offline yourright

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Secret of Electron Affinity?
« on: January 24, 2008, 08:15:31 PM »
So we had this test question and it was a lattice energy question.  So they gave us the lattice energy, first ionization energy of unknown x, second ionization energy of unknown x, third ionization energy of unknown x, bond energy of unknown y, and electron affinity of of unknown y.  The question asked what was the total energy to form compound X2y3.  The process resulted in getting x+3 (g) + y-2 (g).
Since the unknown y needed to become a -2 ion, I believed that you had to do the electron affinity twice, but my teacher said you only needed it once.  Will they always give you the total energies of the electron affinities?

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