How many atoms of neon are found in 20.17 g of neon? 1) 26.98
2)
6.02 x 1023
3
3) 27
4) 13

The number of atoms : =  6.02.10²³

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

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