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Homework Help: Ionization Energy in Electron Volts

  1. Oct 10, 2011 #1
    1. The problem statement, all variables and given/known data

    (10.) It requires roughly 10 eV to ionize one hydrogen atom. How much energy (in joules) are needed to ionize all the hydrogen atoms in one mole of molecular hydrogen (H2)? [Recall: 1 eV = 1.6 × 10−19 J and Avogadro’s constant is about 6 × 1023.]

    2. Relevant equations

    I don't know what equation to use that would include Avogadro's number...this is probably very elementary, I apologize.

    3. The attempt at a solution
  2. jcsd
  3. Oct 10, 2011 #2


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    Don't look for some equation. Think it out.
  4. Oct 10, 2011 #3
    2 atoms;
    (1.6 × 10−19 J) x 20? that simple?
  5. Oct 10, 2011 #4
    How many hydrogen molecules in a mole?
  6. Oct 10, 2011 #5

    (A's# x 2 H molecules)(20 eV)(1.6x10^-19)
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