posted by tula .
sometimes,instead of percentage composition, you will have the composition of a mass sample. using the actual mass of the sample, determine the empirical formula for compounds that have the following analyses.
b. a 13.07g sample of an unknown substance is composed of 9.48g of barium, 1.66g of carbon and 1.93g of nitrogen
c.0.0025 g sample of an unknown substance is composed of 0.0091g manganese, 0.0106g oxygen, and 0.0053 sulfur
They are done the same way. Convert grams to mols and find the ratio.