Here's how to calculate the number of fluorine atoms in 2.5 mol:

1. Avogadro's Number

* Avogadro's number tells us the number of particles (atoms, molecules, etc.) in one mole of a substance. It's approximately 6.022 x 10²³ particles/mol.

2. Calculation

* Step 1: Multiply the number of moles by Avogadro's number:

2.5 mol * (6.022 x 10²³ atoms/mol) = 1.5055 x 10²⁴ atoms

Answer: There are approximately 1.5055 x 10²⁴ atoms of fluorine in 2.5 moles.