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May 28, 2015

Homework Help: Chemistry

Posted by Olivia on Sunday, January 13, 2008 at 3:44pm.

Please help me break this problem down.. Thanks lot.

Light with a wavelength of 425 nm fell on a potassium surface, and electrons were ejected at a speed of 4.88 X 10^5 m/s. What energy was expended in removing an electron from the metal? Express the answer in joules (per electron) and in kilojoules per mole ( of electrons).

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