Question

electromagnetic radiation of wavelength 240nm is sufficient to ionise the sodium atom calculate the ionisation energy of sodium in kj/mol​

Answer 1

Answer:

The ionization energy of sodium will be equal to the energy possessed by the radiation of wavelength 242 nm. It is E=

λ

hc

=

242×10

−9

m

6.626×10

−34

Js×3×10

8

=8.21×10

−19

J.

The ionization energy per mole is 8.21×10

−19

×6.023×10

23

=494000J=494kJ.