What is the empirical formula for a compound if a sample contains 1.0 g of s and 1.5 g of o?

The key principle here is to find the mole ratio of each element to know the empirical formula. First we need to convert the mass to moles by using the molar mass of each element. The molar mass of S is 32 and O is 16 grams/mole. The moles of S and O given the mass is 0.03125 and 0.09375 moles, respectively. The compound would need 3 moles of O per S. the compound is SO3 

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom