Calculate the mass percent of potassium, aluminum, oxygen and sulfur in alumKAl(SO4)2 12H2O
Assume you have one mole of Alumthat means you have: 1 mole K 39 grams 1 mole Al 27 grams 2 moles S 64grams 20 moles O 320 grams (8 moles from the salt and 12 from the water) 24 moles H 24 grams So you have a total of 474 grams, because that is the molar mass of alumFigure out each percentage by dividing the mass of that element by the total mass(remember we are ASSUMING you have 1 moles alum, you have to assume something to do it) K 39g/474g 8.22% Al 27g/474g 5.70% O 320g/474g 67.5% S64g/474g 13.5% H24g/474g 5.06% those all add up to 99.98%.rounding error
