A 1.994-g sample of gypsum, a hydrated salt of calcium sulfate, CaSO_4_, is heated at a temperture greater than 170 degrees C in a crucible until a constant mass is reached. The mass of the anhydrous CaSO_4_ salt is 1.577g. What is the mass percent of water in the hydrated calcium sulfate salt?

Answer 1

mass water lost = 1.994 - 1.577 = ?? grams.
%water = (mass water/mass sample)*100 = ??