The atomic mass of hydrogen is 1.01. What is the mass of hydrogen in one mole of aluminum hydroxide (Al (OH) 3) ?

The answer is 3.03 g

Ar (H) = 1.01 g/mol

Since there are three atoms in Al (OH) 3, the total atomic mass of hydrogen in Al (OH) 3 is:

3 * Ar (H) = 3 * 1.01 g/mol = 3.03 g/mol

The mass (m) is atomic mass (Ar) divided by the number of moles n):

m = Ar/n

Ar = 3.03 g/mol

n = 1 mol

m = 3.03 g/mol / 1 mol = 3.03 g