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Moseley's Law

Electromagnet...

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.

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Solution

Energy of sodium (E)

= 4.947 × 10⁵ J mol^–1

= 494.7 × 10³ J mol^–1

= 494 kJ mol^–1

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