1. Calculate the molar mass of cobalt (II) chloride hexahydrate, which has a chemical formula of CoCl2 6H2O in 4 sig. figs.

2. Calculate the theoretical % of H2O in cobalt (II) chloride hexahydrate in 4 sig. figs.

3. For cobalt (II) chloride hexahydrate, a) What is the formula of the hydrate? b) What is the formula of the anhydride? c) How many molecules of water of hydration are in each formula unit of the hydrate?

4. A sample of hydrate is being heated in a crucible to determine its water content as described in the experiment. What is the criterion for deciding whether a third heating is necessary? Be specific and explain your answer.

5. What is the proper way of using crucible tongs, and why is it best done that way?