A 2.52-g sample of a compound containing only carbon,hydrogen, nitrogen, oxygen, and sulfur was burned in excess O to yield 4.23 g of co2 and 1.01 g oh h2o. Another sample of the same compound, of mass 4.14 g yielded 2.11 g of so3. A third sample of mass 5.66 g, yielded 2.27 g of hno3. Calculate the empirical formula of the compound.