How many oxygen molecules are present in 2Al(OH)3?

To determine the number of oxygen molecules present in the compound 2Al(OH)3, we first need to break down the chemical formula. The formula Al(OH)3 indicates that each aluminum hydroxide molecule consists of one aluminum (Al), three hydroxide ions (OH). Each hydroxide ion contains one oxygen atom.

Since there are three hydroxide ions in one Al(OH)3 molecule, it has three oxygen atoms. When we have two formula units of Al(OH)3, as indicated by the coefficient "2" in front of the formula, we multiply the number of oxygen atoms in a single unit by the number of units:

3 oxygen atoms (from one Al(OH)3) × 2 (the number of formula units) equals 6 oxygen atoms in total.

Thus, the correct answer of 6 reflects the total number of oxygen atoms contributed by both molecules of Al(OH)3.