The gas sulfur dioxide, SO2, oxidizes to form another gas, sulfur trioxide, SO3. How many oxygen atoms are present in 3.20 g of sulfir trioxide?

Answer 1

How many mols SO3 do you have? mols SO3 = grams/molar mass
O atoms in SO3 = 3 O atoms/1 molecule; therefore, 3x that value = mols O atoms.
Then there are 6.02E23 O atoms in 1 mol O atoms; therefore, there are ..... O atoms.