Question

How many moles are in 2.91 x 10^22 molecules of Helium?

Answer 1

0.048 moles

Step-by-step explanation:

To find the number of moles in a substance given it's number of entities we use the formula

`n = (N)/(L) \\`

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

`n = \frac{2.91 * {10}^(22) }{6.02 * {10}^(23) } \\ = 0.048338...`

We have the final answer as

0.048 moles

Hope this helps you