How many moles of Fe2+ are there in a 2.0g sample that is 80% by mass of FeCl2?

Talc (french chalk) is the ingredient

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom