Gypsum is the hydrate of calcium sulfate, CaSO4 · 2 H2O.  It is the primary material in sheet rock, used to make walls in houses. If you heat 21.05 g of the hydrate and drive off the water, what is the weight of the anhydrous salt remaining?  Report your response to the proper degree of certainty and include the correct unit symbol (i.e., g, mL, km, etc.).

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