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Quick Homework Problem on IE


Shadowness

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Ok, we are asked to find the energy required to remove the first electron on Li using Bohr's equation E= -2.179e-18 (Z) (1/n^2-1/n^2) where n is intial and final energy levels and Z is atomic number. I get 1.634e-18 J/ electron. I convert this moles and I get 9.84e5 J or 984 kJ/mol. But it asks to compare this value to the IE value for Li's first electron, which is 520 kJ/mol. It asks if these values are to be the same. I would assume so, but my math says otherwise. Did I mess up somewhere? Thanks in advanced.

 

edit: Sorry didn't notice the homework help thread. But if any can help here that'd be nice >.<

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