wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

An Electromagnetic radiation of wavelength 242 nm is just sufficient to ionize a sodium atom. Calculate the ionization energy of sodium in kJ mol1.


A

294.5KJ mol1

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

394.5 KJ mol1

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

494.5KJ mol1

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D

594.5KJ mol1

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C

494.5KJ mol1


We know that c = vλ v = cλ

and, by Planks Theory

E = hν E = cλ

Now , Energy associated with a photon of 242 nm.

hcλ = 6.626×1034×3.0×108242×109

= 8.21 × 1019 J

Since one atom of Na requires = 8.21 × 1019J for ionization,

6.023 × 1023 atoms of Na for ionization requires.

8.21 × 1019 × 6.023 × 1023 = 49.45 × 104

= 494.5 kJ mol1


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Wave Nature of Light
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon