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A 2.914 gram sample of gypsum, a hydrated salt of calcium sulfat, CaSO4, is heated at a temperature greater than 170 degrees Celcius in a crucible until a constant mass is reached. The mass of the anhydrous CaSO4 salt is 2.304 grams. Calculate the percent by mass of water in the hydrated calcium sulfate salt

  • Chemistry -

    2.914-2.304 = loss in mass = mass H2O lost.
    %H2O = (mass H2O/mass sample)*100 = ?

    Note: A more interesting problem is to calculate the formula of the hydrated CaSO4 from these data.

  • Chemistry -


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