What is the molar mass of Al(OH)3?

The molar mass of Al(OH)3, or aluminum hydroxide, is 78 grams/mole. The compound is known as a hydrate of alumina trihydrate and is in found in nature as a mineral deposit.

When aluminum hydroxide is found in nature it is known as gibbsite. This mineral deposit has a metal hydroxide structure and is held together by hydrogen bonds. It is an amphoteric species and therefore can act as an acid or a base. Besides gibbsite, aluminum hydroxide can also exist in three other polymorphs known as bayerite, nordstrandite and doyleite. Each of the polymorphs of the compound have different crystalline solid structures and different properties.