A 5.3644 g sample of an unknown hydrate of cobalt(II) bromide is heated until all the water of How many moles of CoBr2 are in the sample? mol How many grams of water were lost in the dehydration? g How many moles of water were lost? (mol) What is the value of "n" in the formula CoBr2⋅nH2O? (1, 2, 3, 4…).