Question

How many moles are 7.25 x 1023 formula units of Mgo ?

O A) 1.31 moles
OB) 1.33 moles
OC) 1.42 moles
D) 1.20 moles
O E) 1.27 moles
OF) 1.51 moles
OG) 1.29 moles

Answer 1

The answer is option D

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{7.25 * {10}^(23) }{6.02 * {10}^(23) } = (7.25)/(6.02) \\ = 1.2043189368...`

We have the final answer as

1.20 moles

Hope this helps you