4500 g sample of a mixture containing only lithium sulfate (Li2SO4) and potassium sulfate (K2SO4) was dissolved in water.

A 0.4500 g sample of a mixture containing only lithium sulfate (Li2SO4) and potassium sulfate (K2SO4) was dissolved in water. Barium chloride (BaCl2) was added to this solution until precipitation was complete. After further treatment the mass of the barium sulfate was determined to be 0.8264 g. Determine the percent of lithium sulfate in the original sample. Determine the percent of potassium in the original sample.