Question

How many atoms of neon are found in 20.17 g of neon?

Answer 1

The number of atoms : =  6.02.10²³

Further explanation

Given

mass = 20.17 g of Neon

Required

The number of atoms

Solution

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

mol Neon :

= mass : Ar Neon

= 20.17 : 20,1797 g/mol

= 0.999 ≈ 1

The number of atoms :

= 1 x  6.02.10²³

=  6.02.10²³