Question: what is the empirical formula if you have 53 aluminum and 47 oxygen?
Answer: Assuming a sample weight of 100 g, there would be 53 g of Aℓ and 47 g of O. 3 , we need to multiply by 2. aluminum : oxygen = 1 : 1.5 = 2 : 3 So the empirical formula is Aℓ2O3.