# 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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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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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.`