Question

an eletromagnetic radiation of wavelength 242nm is just sufficient to ionise sodium ion, the ionisation energy of sodium ion is​

Answer 1

Answer:

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

$\large\rm { E = \frac {hc}{λ}}$

$\large\rm { = \frac {6.626 × 10^{-34} Js × 3 × 10^{8}}{242 × 10^{-9}}}$

$\large\rm { = 8.21 × 10^{-19} J}$

The ionization energy per mole is

$\large\rm { 8.21 × 10^{-19} × 6.023 × 10²³ }$

$\large\rm { = 494000J \ or \ 494kJ}$