Periodicity in atomic properties

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By Expert Faculty of Sri Chaitanya
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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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