Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in kJ mol^-1.

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Payal Gupta | Contributor-Level 10

9 months ago

Given: λ = 242 nm = 142 x 10^-9 m, c = 3 x 10⁸ ms^-1, h = 6.626 x 10^-34Js

We know, E = hc / λ

= (6.626 * 10^-34 Js) x (3 * 10⁸ m s^-1) / (242 * 10^-9 m) = 0.0821 x 10^-17 J

∴ Ionization energy per mol (E) = (0.0821 x 10^-17 J) x (6.022 x 10²³ mol^-1J) / 1000 = 494 kJ mol^-1

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