In iron(II) ammonium sulfate hexahydrate, per 1 mole of compound, there are __________moles of iron ___________and moles of water.
a) 1 mole of iron (II) and 6 moles of water.
b) 1 mole of iron (II) and 1 mole of water.
c) 2 moles of iron (II) and 6 moles of water.
d) 2 moles of iron (II) and 1 mole of water.