Question: how many molecules are in 1.5 moles of f2?
Answer: In 1.5 moles of fluorine gas, there are 1.5⋅6.022⋅1023 molecules of gas. However, since fluorine is diatomic ( F2 ), each molecule contains two atoms of fluorine. Thus, the number of atoms in 1.5mol of F2 is twice the number of molecules.