Results 1 to 2 of 2

Math Help - Ionization energy and wavelength problem

  1. #1
    Newbie
    Joined
    Dec 2011
    Posts
    13

    Ionization energy and wavelength problem

    I can't figure this problem out, despite using E = hc/lambda...

    The first ionization energy for potassium in the vapor state is 418.8 kJ/mol. Determine the longest wavelength that could be used to ionize an atom of potassium.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1

    Re: Ionization energy and wavelength problem

    Quote Originally Posted by Hamzawesome View Post
    I can't figure this problem out, despite using E = hc/lambda...

    The first ionization energy for potassium in the vapor state is 418.8 kJ/mol. Determine the longest wavelength that could be used to ionize an atom of potassium.
    E = \dfrac{hc}{\lambda} only works for individual molecules. You need to find a scale factor between moles and molecules (think Avogadro) and watch the units, E in that equation is in joules whereas your value is in kJ

    edit: I get an answer of 285.6nm
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Generalised energy and energy (lagrangian mechanics)?
    Posted in the Advanced Applied Math Forum
    Replies: 2
    Last Post: January 16th 2012, 03:03 AM
  2. kinetic energy during energy levels
    Posted in the Math Topics Forum
    Replies: 0
    Last Post: December 27th 2010, 01:12 AM
  3. Wavelength problem.
    Posted in the Math Topics Forum
    Replies: 4
    Last Post: June 23rd 2010, 08:26 PM
  4. Ionization constants for acids and bases
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: March 14th 2010, 09:33 PM
  5. Replies: 7
    Last Post: April 17th 2006, 01:04 PM

Search Tags


/mathhelpforum @mathhelpforum