The relative molecular mass of sodium bicarbonate is 84.01.The chemical formula of sodium bicarbonate is NaHCO3, in which the relative atomic mass of Na is 23, the relative atomic mass of H is 1, the relative atomic mass of C is 12, the relative atomic mass of O is 16, according to the calculation method of the relative molecular mass, i.e., the relative molecular mass of a molecule is equal to the sum of the relative atomic masses of the atoms that compose the molecule. So the relative molecular mass of sodium bicarbonate is 84.01. Sodium bicarbonate is an inorganic salt, white crystalline powder, odorless, alkaline taste, easily soluble in water, in moist air or hot air that is slowly decomposition, carbon dioxide, heated to 270 degrees Celsius, complete decomposition, acid is strongly decomposition of carbon dioxide.