NCERT Class XI Chemistry Structure of Atom Solutions

Question : 10

Total: 67

Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in kJmol–1.

Solution:

Here, λ = 242 nm = 242 × 10–9 m
I.E. =

6.626×10−34×3×108

242×10−9

= 8.214 × 10−19 J/atom
Ionisation energy of sodium in kJmol–1 = 8.214 × 10–19 × 10–3 × 6.022 × 1023
= 494.65 kJmol–1

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