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19 Nov 2019
Stoichiometry-Hydrates Prelaboratory Assignment Name and Drawer Number 1. The data listed below was determined from the dehydration of a hydrate of calcium sulfate. Mass of empty crucible- 17.274 g Mass crucible and calcium sulfate hydrate- 19.084 g Mass of crucible and anhydrous calcium sulfate 18.705 g a. Write the chemical formulas for water and anhydrous calcium sulfate. From the formulas calculate the molar masses of water and anhydrous calcium sulfate. b. Calculate the mass of water removed from the hydrate during the drying process from the difference between the mass of the crucible and hydrate and the mass off the crucible and the anhydrous salt. c. Use the mass of water (part and the molar mass of water to calculate the moles of water in the sample. d. Determine the mass of anhydrous calcium sulfate by subtracting the mass of the empty crucible from the mass of the crucible containing the anhydrous compound. e. Use the molar mass of the anhydrous compound and the mass of the anhydrous compound (part ld) to determine the number of moles of anhydrous salt. f Determine the ratio of the number of moles water in the hydrate to the number of moles of anhydrous salt in hydrate by dividing the answer from part 1c by the answer from part le. This value is the number of water in the hydrate for each mole of the anhydrous salt. Use this value to write the chemical formula for the hydrate. (Continued on Next Page)
Stoichiometry-Hydrates Prelaboratory Assignment Name and Drawer Number 1. The data listed below was determined from the dehydration of a hydrate of calcium sulfate. Mass of empty crucible- 17.274 g Mass crucible and calcium sulfate hydrate- 19.084 g Mass of crucible and anhydrous calcium sulfate 18.705 g a. Write the chemical formulas for water and anhydrous calcium sulfate. From the formulas calculate the molar masses of water and anhydrous calcium sulfate. b. Calculate the mass of water removed from the hydrate during the drying process from the difference between the mass of the crucible and hydrate and the mass off the crucible and the anhydrous salt. c. Use the mass of water (part and the molar mass of water to calculate the moles of water in the sample. d. Determine the mass of anhydrous calcium sulfate by subtracting the mass of the empty crucible from the mass of the crucible containing the anhydrous compound. e. Use the molar mass of the anhydrous compound and the mass of the anhydrous compound (part ld) to determine the number of moles of anhydrous salt. f Determine the ratio of the number of moles water in the hydrate to the number of moles of anhydrous salt in hydrate by dividing the answer from part 1c by the answer from part le. This value is the number of water in the hydrate for each mole of the anhydrous salt. Use this value to write the chemical formula for the hydrate. (Continued on Next Page)
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Lelia LubowitzLv2
16 Mar 2019
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