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Ionization energy is defined as the minimum energy required to remove an electron from the ground state (n0) to infinity (n∞). Determine the wavelength of radiation required to ionize the hydrogen electron from the n = 2 energy level. Calculate the energy (Joules) associated with this photon. (1 cm-1 = 1.986 x 10-23 J)

I will be happy to critique your work.

You may use the value you find for R in the next problem (or the value from a text) to solve for lambda, then E = hc/lambda will calculate energy in Joules. As Bob Pursley says, post your work if you get stuck and we will help you through it. h is Planck's constant and c is the speed of light in meter/second.

  • chem -

    (6.63e-34)(3e8) / (5.444e19) = 3.634e-7

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