The ionization energy of sodium in kJ mol ^ – 1 . If electromagnetic radiation of wavelength 242nm is just sufficient to ionize sodium atom is ______.(nearest integer)

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The ionisation energy of one sodium atom $= \dfrac{hc}{\lambda}$

& the ionisation energy of one mole $Na$ atom $= \dfrac{hc}{\lambda}{N}_{A} = \dfrac{6 . 62 \times {10}^{- 34} \times 3 \times {10}^{8} \times 6 . 02 \times {10}^{23}}{242 \times {10}^{- 9}} = 494 . 03kJ / mol$

The ionization energy of sodium in kJ mol ^ – 1 . If...

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