What happens to the reported percent water if the salt thermally decomposes yielding a volatile product

calculated value for the number of hydrating water molecules would increase above its true level, because the total weight loss would be greater than expected.following are the signs
) loss of water of hydration usually occurs at a considerably lower temperature than decomposition of the salt
 dehydration often results in a change of appearance of the sample
the weight of the sample decreases to a constant stable value
 the calculated number of molecules of water lost should take an integer value

You know how the first one if filled up like the objects do the same but with the other categories

Exothermic,  physical change after it is already baked