1 Answer

Petrik · Answer 1 · 2021-09-06T11:47:43+0000

Answer:

127.57 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

$n = \frac{7.68 * {10}^(25) }{6.02 * {10}^(23) } \\ = 127.574750...$

We have the final answer as

Hope this helps you