The Most Abundant Metal in Earth's Crust Is Aluminum, Found

Multiple Choice

The most abundant metal in Earth's crust is aluminum, found mostly in the form of clays.Bauxite ore, impure hydrated aluminum oxide, can be purified and refined to make the metal.After the first purification step, hydrated aluminum oxide (Al₂O₃ .xH₂O) is obtained.When 100.0 g of this solid was heated and the water driven off, 65.36 g of Al₂O₃ remained.How many water molecules (x in the molecular formula) were there in the hydrate?

A) 1
B) 2
C) 3
D) 4
E) 5