Homework Help: Chemistry

Posted by Lorry on Tuesday, November 1, 2011 at 3:52pm.

Please help i don't get the answer. How much energy, in kilojoules per mole, is released when an electron makes a transition from n=5 to n=2 in an hydrogen atom?

Chemistry - DrBob222, Tuesday, November 1, 2011 at 3:56pm
E = 2.180E-19J x (1/4 - 1/25)
1/4 is 1/n^2 = 1/2^2 for the lower level
1/25 is 1/n^2 = 1/5^2 for the higher level

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