1. Find the molar mass of fluorine:
* The molar mass of fluorine (F) is 19.00 g/mol (you can find this on the periodic table).
2. Convert grams to moles:
* Divide the mass of fluorine by its molar mass:
25.9 g / 19.00 g/mol = 1.36 mol
3. Use Avogadro's number:
* Avogadro's number is 6.022 x 10^23 atoms/mol. This tells us the number of atoms in one mole of any element.
* Multiply the number of moles of fluorine by Avogadro's number:
1.36 mol * 6.022 x 10^23 atoms/mol = 8.19 x 10^23 atoms
Therefore, there are approximately 8.19 x 10^23 atoms of fluorine in 25.9 grams.
