A neon sign contains 2.01 X 1021 atoms of the gas. How many moles of neon are in the sign? a
1.21 X 1045 mole Ne

b
3.34 X 10-3 mole Ne

c
2.00 X 102 mole Ne

d
12.10 X 102 mole Ne

b. 3.34 x 10^-3

Explanation:

According to Avogadro's constant, in one mole, there are 6.02 x 10^23 atoms. To see how many moles are in 2.01 x 10^21 atoms, you would divide it by the amount of atoms that fit in a mole.

2.01 x 10^21 atoms / 6.02 x 10^23 = 0.00334 moles, which can be

converted to 3.34 x 10^-3 moles