Question

Determine the number of moles in a sample of calcium that contains 6.34 x 1022
atoms.

Answer 1

0.105 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{6.34 * {10}^(22) }{6.02 * {10}^(23) } \\ = 0.105315...`

We have the final answer as

0.105 moles

Hope this helps you