Answer:
The answer is
4318.94 moles
Explanation:
To find the number of moles of 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
N = 2.60x10^27 atoms of boron
The number of moles is
[tex]n = \frac{2.60 \times {10}^{27} }{6.02 \times {10}^{23} } \\ = 4318.93687...[/tex]
We have the final answer as
4318.94 moles
Hope this helps you
