Elemental sulfur occurs as octatomic molecule S8. What is the mass of Fluorine gas needed to react completely with 19.9 g of Sulfur to form sulfur hexafluoride?

Answer 1

Relative atomic mass of F₂ = 19
RAM of Sulphur = 32
Mass of fluorine required to form SF₆
= 19.9*(6*19)/32
= 70.9 g