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A 1.803-g sample of gypsum, a hydrated salt of calcium sulfate, CaSO4, is heated at a temperature greater than 170C in a crucible until a

A 1.803-g sample of gypsum, a hydrated salt of calcium sulfate, CaSO4, is heated at a temperature greater than 170°C in a crucible until a constant mass is reached. The mass of the anhydrous CaSO4 salt is 1.426 g.

Calculate the percent by mass of water in the hydrated calcium sulfate salt.

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