A sample of an unknown sulfate compound has a mass of 0.356

Last updated: 7/30/2022

A sample of an unknown sulfate compound has a mass of 0.356 grams. Addition of excess barium chloride forms a barium sulfate precipitate with a mass of 0.281 grams. What is the mass % of sulfate ion in the unknown sample? Round your answer to 2 decimal places.