Assuming 100 g of compound
50.05 g S x 1 mol S/32 g S = 1.56 moles S present
49.95 g O x 1 mol O/16 g O = 3.12 moles O present
mole ratio of O to S is 3.12/1/56 = 2 to 1
Empirical formula = SO2
P2o5
Cr3Si2 is the empirical formula for a compound containing chromium and silicon an has 73.52 mass percent chromium.
S2o3
MgO
CaSO4
Chi a+
P2o5
Cr3Si2 is the empirical formula for a compound containing chromium and silicon an has 73.52 mass percent chromium.
CHI3
p2o5
KCl
S2o3
MgO
C4h2s
CaSO4
If it tells you to find the empirical formula when percent composition is given or if the mass of each element is given in a specific compound.
Fe2S3, I think...