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Molar mass of Aluminium hydroxide, Al(OH)₃ is 78.0036 g/mol

Molar mass is the mass of 1 mole of a substance, so we can add the masses of 1 mole of sodium, one mole of hydrogen and one mole of oxygen.

22.99+16.00+1.01=40

So, the molar mass of NaOH is 40 g/mol