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Periodicity in atomic properties

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By Expert Faculty of Sri Chaitanya
Question

How much energy will be needed to convert 2.5 mol of Li atoms in the gaseous state to form Li (g)? First I.P of Li= 5.41 eV. 

Moderate
Solution

I.P. of Li = 5.41 eV atom-

×6.023×1023×1.602×1019Jmol1eV atom =522×103Jmol

 Energy needed to convert 2.5 mol Li (s) to Li (g) 

=2.5mol×522×103Jmol=1305kJ


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