Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom . Calculate the ionisation energy of sodium in kJ `mol^(-1)`.A. `494.65`B. `400`C. `247`D. `600`

Electromagnetic radiation of wavelength 242 nm is just sufficient to i

1.	Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom . Calculate the ionisation energy of sodium in kJ `mol^(-1)`.A. `494.65`B. `400`C. `247`D. `600`
Answer» Correct Answer - A I.E. of one sodium atom `=(hc)/(lambda)` & I.E. of one mole `Na` atom `=(hc)/lambda N_(A)=(6.62xx10^(34)xx3xx10^(8)xx6.02xx10^(23))/(242xx10^(-9))=494.65 kJ.mol.`

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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)`.A. `494.65`B. `400`C. `247`D. `600`

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