Atomic StructureHard

Question

Electromagnetic radiations of wavelength 240 nm are just sufficient to ionize sodium atom. The ionization energy of sodium (in kJ/mol) is

Options

A.5.167
B.498.58
C.118.83
D.51.67

Solution

$I.E. = \frac{hc}{\lambda} = \frac{6.62 \times 10^{- 34} \times 3 \times 10^{8}}{240 \times 10^{- 9}} \times 6.022 \times 10^{23} = 4.98 \times 10^{5}\text{ J/mol}$

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