Question

The compound iron (II) chloride trihydrate has ____ mole(s) of water for every ____ mole(s) of ionic compound.

Answer 1

three, one
two, three
one, three
three, two

Answer 2

We generally view hydrates as being one molecule of salt surrounded by a certain number of water molecules. So the number for the ionic compound should always be 1. As for the water: remember your prefixes? TRI-hydrate?