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ChemistryAtomic StructureMiscellaneous/MixedMedium2 minPYQ_2024

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

Answer:

494

Solution:

The ionisation energy of one sodium atom $= \frac{hc}{λ}$

& the ionisation energy of one mole $Na$ atom $= \frac{hc}{λ} N_{A} = \frac{6.62 \times 10^{- 34} \times 3 \times 10^{8} \times 6.02 \times 10^{23}}{242 \times 10^{- 9}} = 494.03 kJ / mol$

Stream:JEESubject:ChemistryTopic:Atomic StructureSubtopic:Miscellaneous/Mixed

⏱ 2mℹ️ Source: PYQ_2024

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