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Question
Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in kJ mol–1.
Numerical
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Solution
Energy of sodium (E) = `("N"_"A""hc")/lambda`
=`((6.023xx10^23 "mol"^(-1))(6.626xx10^(-34) "Js")(3xx10^8 "ms"^(-1)))/(242xx10^(-9))`
= 4.947 × 105 J mol–1
= 494.7 × 103 J mol–1
= 494 kJ mol–1
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