Question

How many moles are 2.50x10^21 atoms of silicon?

Answer 1

The answer is 0.0042 moles

Step-by-step explanation:

To find the number of moles of 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

N = 2.50 × 10²¹ atoms of silicon

So we have

`n = \frac{2.50 * {10}^(21) }{6.02 * {10}^(23) } \\ = 0.0041528239...`

We have the final answer as

0.0042 moles

Hope this helps you