а). Ammоnium nitrаte is а cоmpоund commonly used in fertilizers as a rich source of nitrogen. A 25.0 g sample of pure ammonium nitrate is analyzed. Calculate the amount in moles in this 25.0 g sample. (2 marks) b). A 75.0 g sample of a hydrated salt, commonly known as 'blue vitriol' or copper(II) sulfate pentahydrate, is used in a lab experiment. Calculate the total number of moles present in the 75.0 g sample. (3 marks)