1. Calculate the number of moles present in 23 g of sodium. (Atomic mass of sodium = 23)

Given  mass  of  Sodium  =  23g

Molar mass (that is mass of 6.023 X 1023 atoms) of  Sodium [Na]  =  23g

Therefore,  number  of  moles 'n'  =  Given  mass 'm'  /  Molar  mass  'M'

ie,  n  =  23 / 23

=1  mole.

 .

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