Question

Electromagnetic radiation of wavelength 242nm is just sufficient to ionise na atom.The ionisation energy of na in kj mol-1

Answer 1

Answer:

$8.21*10^{-19}$kJ

Explanation:

the given wavelength of an electromagnetic radiation is= 242nm= $242*10^{-9}m$

the energy associated with this wavelength can be calculated by the formula

E=hc//\

here E stands for energy

h stands for Plank's constant whose value is $6.626*10^{-34}$ Js

c is the speed of light whic is equal to $3*10^{8}m/s$

/\ stands for the  wavelength

so

E=$6.626*10^{-34} * 3*10^{8} / 242*10^{-9} = </p><p>8.21 * 10^{-19}$kJ

since it is the minimum energy required to remove valence election from Na...it is the I.E. of Na

So I.E. energy of Na is $8.21 * 10^{-19}kJ$