For the following questions (Q1-Q4), consider the compound CoCl2 • 6H2O (cobalt (II) chloride hexahydrate) which comes as beautiful red-purple crystals. Katie weighs out 2.51 g of the CoCl2 • 6H2O compound on the balance for her experiment. Q1. Determine the molar mass of CoCl2 • 6H2O compound. Q2. Convert 2.51 g of the CoCl2 • 6H2O to moles. Q3. Katie heats her hydrate to remove the water and obtain the anhydrous cobalt (II) compound CoCl2. Her results are below. Complete Katie’s data table of experimental results. Mass of dry crucible + lid 42.37 g Mass of dry crucible + lid + CoCl2 • 6H2O (hydrate) 44.88 g Mass of CoCl2 • 6H2O 2.51 g Mass of crucible + lid + CoCl2 (after heating) 43.79 g Mass of CoCl2 (anhydrous) g Mass of water removed g Molar mass of water 18.02 g/mol Molar mass of CoCl2 129.84 g/mol Moles of H2O mol Moles of CoCl2 mol Molar ratio of water to CoCl2 (experimental) Molar ratio of water to CoCl2 (theoretical) 6.00 % error of the molar ratio % Q4. What was the most likely source of error in Katie’s experiment?
For the following questions (Q1-Q4), consider the compound CoCl2 • 6H2O (cobalt (II) chloride hexahydrate) which comes as beautiful red-purple crystals. Katie weighs out 2.51 g of the CoCl2 • 6H2O compound on the balance for her experiment.
Q1. Determine the molar mass of CoCl2 • 6H2O compound.
Q2. Convert 2.51 g of the CoCl2 • 6H2O to moles.
Q3. Katie heats her hydrate to remove the water and obtain the anhydrous cobalt (II) compound CoCl2. Her results are below. Complete Katie’s data table of experimental results.
|
Mass of dry crucible + lid |
42.37 g |
|
Mass of dry crucible + lid + CoCl2 • 6H2O (hydrate) |
44.88 g |
|
Mass of CoCl2 • 6H2O |
2.51 g |
|
Mass of crucible + lid + CoCl2 (after heating) |
43.79 g |
|
Mass of CoCl2 (anhydrous) |
g |
|
Mass of water removed |
g |
|
Molar mass of water |
18.02 g/mol |
|
Molar mass of CoCl2 |
129.84 g/mol |
|
Moles of H2O |
mol |
|
Moles of CoCl2 |
mol |
|
Molar ratio of water to CoCl2 (experimental) |
|
|
Molar ratio of water to CoCl2 (theoretical) |
6.00 |
|
% error of the molar ratio |
% |
Q4. What was the most likely source of error in Katie’s experiment?
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