Q: How many atoms of fluorine are in 5.6 x 10^22 molecules of MgF2?

Flexi Says: Use the subscripts in a chemical formula to determine the number of atoms per molecule. For example, in the formula of MgF₂, there is one Mg atom and 2 fluorine atoms per molecule. So 1 mol of MgF₂ molecule has 2 mols of fluorine. Therefore in 5.6×10²² molecules of MgF₂, there will be 2 (5.6×10²²), or 1.12x10²³, atoms of fluorine (F).