The common molecular formula for disaccharide is

The common molecular formula for disaccharides is C12H22O11. Disaccharides are formed by condensation of two monosaccharides, usually either a hexose or pentose. The monosaccharides combine with a dehydration synthesis reaction to produce water, and disaccharide is the product of this reaction and has the molecular formula C12H22O11. This reaction differs from the addition of two monosaccharides because it does not involve the addition of any new atoms or molecules, but rather a rearrangement of atoms that were already present in the monosaccharides.