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Electromagnetic radiatio of wavelength 2...

Electromagnetic radiatio 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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Ionisation energy of sodium `(E)=Nhv=Nh(c)/(lamda)`
or, `E=((6.022xx10^(23))xx(6.626xx10^(-34))xx(3xx10^(8)))/(242xx10^(-9))`
`=4.946xx10^(5)J*mol^(-1)=494.6kJ*mol^(-1)`
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