Question

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

Answer 1

To determine the number of moles of neon in the sign, divide the number of atoms by Avogadro's number. The correct answer is 3.33 x 10^-3 mole Ne. option b.

Step-by-step explanation:

To determine the number of moles of neon in the sign, we need to use Avogadro's number and the amount of atoms given. Avogadro's number is approximately 6.022 x 10^23 atoms/mol.

Given that the sign contains 2.01 x 10^21 atoms of neon, we can calculate the number of moles using the formula:

Moles = Number of atoms / Avogadro's number

Plugging in the values: Moles = (2.01 x 10^21) / (6.022 x 10^23) = 3.33 x 10^-3 mole Ne.

Therefore, the correct answer is option b) 3.33 x 10^-3 mole Ne.

Answer 2

b. 3.34 x 10^-3

Step-by-step 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