I would do it the other way around.
delta E = 2.180 x 10^-18 J*[(1/n1^2)-(1/n2^2)]. With the Balmer series, n1 is 2 and n2 is infinity.
Then delta E = hc/wavelength.
The reason reciprocal cm is given (cm^-1) is because wave number = 1/wavelength and many spectroscopists prefer to use wave number instead of wavelength. Also, if you use the Rydberg constant, then
1/wavelength = R[(1/N1^2) - (1/N2^2)] and you don't need to convert to wavelength first to get energy in joules.
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)
do I use E = -RH / n^2 ?
I don't know why I'm given the cm to J conversion, or why they ask for the wavelength first.
3 answers
ok so 1/lambda = (2.18e-19) (.25 - 0)
1/lambda = 5.45e-19
then i set up a proportion to convert it into joules?
1 cm-1/1.986e-23 joules = 5.45e-19 cm-1/x
I got x = 1.082e-41 joules and that it so not right..
1/lambda = 5.45e-19
then i set up a proportion to convert it into joules?
1 cm-1/1.986e-23 joules = 5.45e-19 cm-1/x
I got x = 1.082e-41 joules and that it so not right..
thank you i got it now!!
thanks so much for your help!!
thanks so much for your help!!