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Homework Help: The ionization energy of atomic hydrogen?

  1. Oct 26, 2008 #1
    1. The problem statement, all variables and given/known data
    According to the Bohr theory, what is the ionization energy of atomic hydrogen in kJ/mol?

    2. Relevant equations
    Bohr equation: E = (-2.18 x 10-18 J)(1/n2)

    3. The attempt at a solution
    I don't have any general idea on how to do this problem :( please help!

    The answer is: 1.31 x 103 kJ/mol
  2. jcsd
  3. Oct 27, 2008 #2


    User Avatar

    Staff: Mentor

    You need to use Rydberg formula. Note, that it can be easily derived from what you called Bohr equation.

    Alternatively - what n means? What value does it have in unexcited hydrogen atom? What values does it take when atom gets ionized? These two n values give you two energies - that of unexcited and that of ionized atom. What is the difference between them?

    But it boils to exactly the same.
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