Electromagnetic radiation of wavelength 242 nm is just sufficient to ionize the sodium atom. Calculate the ionization energy of sodium in kJ mol^(-1)

Electromagnetic radiation of wavelength 242 nm is just sufficient to i

1.	Electromagnetic radiation of wavelength 242 nm is just sufficient to ionize the sodium atom. Calculate the ionization energy of sodium in kJ mol^(-1)
Answer» SOLUTION :`E = N hv = Nh (C)/(lamda) = ((6.02 xx 10^(23) mol^(-1)) xx (6.626 xx 10^(-34) JS) xx (3 xx 10^(8) ms^(-1)))/(242 xx 10^(-9) m)` `= 4.945 xx 10^(5) J mol^(-1) = 494.5 kJ mol^(-1)`