How many moles are in a sample of 4.57 x 10^24 atoms of neon (ne)?

Hello!

To find the number of moles in a sample of 4.57 x 10^24 atoms, we need to use Avogadro's number, which is 1 mole = 6.02 x 10^23.

To find how many moles, we divide the given sample by Avogadro's number.

(4.57 x 10^24) / (6.02 x 10^23) ≈ 7.59136

Using the amount of significant figures given (3), the answer is 7.59 moles of neon (Ne).

the answer for sodium is 0.186

the answer for rubidium is 0.251