Q. 19

What is the number of zinc atoms in a piece of zinc weighing 10 g?

(Atomic mass of Zn = 65 u)

Answer :

Mole concept provides a relationship between number of particles(atoms) and their mass. Thus it is possible to calculate the number of particles in a given mass.

Molar mass of Zinc(Zn) = 65g


Given Mass of the Zinc = 10g


As we know that, Number of moles = mass of an element/molar mass of an element


Hence Number of moles= 10g/65g = 0.15 moles.


Since 1 mol of zinc contains 6.02 × 1023 atoms


Therefore, 0.15 mol of zinc contains = 6.02 × 1023 × 0.15 mol = 9.03 × 1022 atoms of zinc


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