Al(SO4)3 ^That is completely wrong. Al(SO4)3 is aluminum sulfate cobalt ii sulfide is CoS actually you both are wronq. its really CoSO4 <<< cobalt sulfate Wow. He/She was right. Your totally wrong. Cobalt (II) Co^2+ and Sulfide is S^2- So the answer is CoS. Signs cancel themselves out..
Convert the number of grams given into percentage: 0.884/2.086=42.37% 0.482/2.086=23.1% 0.720/2.086=34.51% Then assume the percentage represent a mass in grams and calculate the amount of moles present in that mass: For Cobalt 42.37g/58.93g/mol= 0.72 mol (simplify units) For Sulphur 23.1g/32.06g/mol= 0.72 mol For Oxygen 34.51g/16g/mol= 2.16 mol Take the numbers of moles obtained and divide it by the smallest value: 0.72/0.72=1 0.72/0.72=1 2.16/0.72= 3 Therefore, the simplest formula is CoSO3