Question

Calculate the number of atoms in 9g of Aluminium 27

Answer 1

No. Of particles = Moles x Avagadros No.

Where

Moles (n) = Given mass / Molar mass

Avagadros no. = NA= 6.02 x 10 ^ 23

So here

Given mass = 9g

Molar mass = 27g/mol

Moles = 9/27

= 0.333

No. Of atoms = 0.333 x 6.02 x 10^23

= 2 x 10^23 atoms

Answer..

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hope it helps