Question 2.10: Electromagnetic radiation of wavelength 242 nm is just sufficient to ionize the sodium atom. Calculate the ionization energy of sodium in kJ mol–1.
Question 2.10: Electromagnetic radiation of wavelength 242 nm is just sufficient to ionize the sodium atom. Calculate the ionization energy of sodium in kJ mol–1.
Ans 2.10: The energy of sodium is
E = Nhc/Λ
Given Λ = 242 nm = 242 × 10-9 m
Avogadro’s No (N) = 6.023 × 1023
Planks Constant (h) = 6.626 × 10-34 Js
Velocity of light (c) = 3 × 108 m/s
= 6.023 × 1023 × 6.626 × 10-34 × 3 × 108 / 242 × 10-9
E = 4.947 × 105 J mol–1
Advertisement
