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

The ionisation energy of sodium is '494.7 kJ' mol '^(-1)'. Calculate the wavelength of the electromagnetic radiation which is just sufficient to ionise the sodium atom. [Given: '.C=3 x 10^8 ms^(-1), h=6.6 x 10^(-34) Js, N_A=6.02 x 10^(23) mol^(-1)]'

Calculate the energy needed to convert three moles of sodium atoms in the gaseous state to sodium ions, The ionization energy of sodium is 495 kJ mol^(-1)

Energy of an electron in the ground state of hydrogen atom is -2.18 xx 10^(-18) J . Calculate the inoisation enethalpy of atomic hydrogen in J mol^(-1) .

Wavelength of high energy transition of hydrogen atoms is 91.2 nm. Calculate the corresponding wavelength of He atoms.