How to calculate the relative molecular weight of aluminum hydroxide?

To complete this task, we need a periodic table.
Molecular mass is the mass of a molecule, expressed in atomic mass units (amu). To calculate it, you need to add the atomic weights of the elements that make up the molecule.
Aluminum hydroxide – Al (OH) 3
Mr (Al (OH) 3) = Ar (Al) + 3Ar (O) + 3Ar (H) = 26 + 3 * 16 + 3 * 1 = 75



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