The Ionisation energy of Li is 520 kJ mol–1. The amount of energy required to convert 140 mg of Li atoms into gaseous Li+ ions is:
The ionization enthalpies of Li and Sodium are 520 KJ/mole and 495 KJ/mole respectively. The energy required to convert all the atoms present in 7mg of Li vapours and 23 mg of Sodium vapours to their respective gaseous cations respectively are