The molar mass of Al(OH)₃, also known as aluminum hydroxide, is calculated by adding the atomic masses of all the atoms in the compound. Here’s how it’s done:
- Aluminum (Al) has an atomic mass of approximately 26.98 g/mol.
- Oxygen (O) has an atomic mass of approximately 16.00 g/mol.
- Hydrogen (H) has an atomic mass of approximately 1.01 g/mol.
In Al(OH)₃, there is 1 aluminum atom, 3 oxygen atoms, and 3 hydrogen atoms. Therefore, the molar mass is calculated as follows:
Molar mass of Al(OH)₃ = (1 × 26.98) + (3 × 16.00) + (3 × 1.01)
Molar mass of Al(OH)₃ = 26.98 + 48.00 + 3.03
Molar mass of Al(OH)₃ = 78.01 g/mol
So, the molar mass of aluminum hydroxide (Al(OH)₃) is approximately 78.01 grams per mole.