Final answer:
The correct dehydration equation for calcium chloride 6-hydrate is CaCl2·6H2O ⇌ CaCl2 + 6H2O, which represents the release of six water molecules from the hydrated compound. The correct option is A.
Step-by-step explanation:
The dehydration equation for calcium chloride 6-hydrate, CaCl2·6H2O, is correctly represented by equation a) CaCl2·6H2O ⇌ CaCl2 + 6H2O. This means that calcium chloride hexahydrate will release six water molecules when it dehydrates to form anhydrous calcium chloride.
The process of dehydration can be reversed, allowing the anhydrous calcium chloride to reabsorb water and revert to its hydrated form, but this would be represented by the opposite reaction, which is not what the question is asking.