Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in kJ mol -1.

Question 2.10: Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in kJ mol ^-1.
Answer
Energy of sodium (E)


= 4.947 × 10⁵ J mol ^-1
= 494.7 × 10³ J mol ^-1
= 494 kJ mol^-1