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posted by Anonymous on Tuesday, April 20, 2010 at 10:37pm.
What is the change in energy, Delta E, in kilojoules per mole of hydrogen atoms for an electron transition from n=5 to n=2?
delta E = 2.180 x 10^-18 J*(1/n1^2 - 1/n2^2) where n1<n2.
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