Answer:
Every substance, whether an element or a compound that contains Avogadro's number, is said to form a mole of it. Therefore for the fluorine atoms that form the Avogadro number we say that we have one mole of fluorine atoms and this weighs 19 g, so 19 g/mol
Explanation:
You can search the F in the Periodic Table where you have the molar mass, 19 g/mol but if you don't have a Periodic Table you can calculate like this:
1 atom of F weighs 19 Da (unified atomic mass unit) and 1 Da is 1,661 x10*-24 g, so try to apply a rule of three, twice.
1 Da ........... 1,661x10*-24 g
19 Da .......... x
x= (19 Da . 1,661x10*-24 g ) / 1 Da = 3,1559x10*-23 g
1 atom F .............. 3,1559x10*-23 g
6,022x10*23 atoms F ............. x
X= (6,022x10*23 atoms F . 3,1559x10*-23 g) / 1 atom F = 19.0048 g
