The molecular formula for Aluminum Sulphate should be Al2(SO4)3 or it can also be written less concisely as Al2SO12S3.
(not exactly sure what the empirical formula is, but I think it just remains the same because all the elements are not divisible by the same number for a proper ratio.)
(not exactly sure what the empirical formula is, but I think it just remains the same because all the elements are not divisible by the same number for a proper ratio.)