Answer:
The answer is
[tex] \huge 2.16 \times {10}^{ - 9} \: \: \: mol[/tex]
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
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
[tex]n = \frac{1.3 \times {10}^{15} }{6.02 \times {10}^{23} } \\ = 2.159 \times {10}^{ - 9} [/tex]
We have the final answer as
[tex]2.16 \times {10}^{ - 9} \: \: \: moles[/tex]
Hope this helps you
