Determine the total solids in the sample; express total solids in units of g/kg sample (parts per thousand, ppt). Assume the density of the river water to be 1.01 g/mol. A 25.0 mL aliquot of a well-shaken sample of river water is pipette into a 27.211 g evaporating dish. After the mixture is evaporated to dryness, the dish and the dried sample have a mass of 43.617 g.