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To draw the structural formula for lactose, start with a glucose molecule. Attach a galactose molecule to the glucose molecule through a beta-1,4 glycosidic bond. This forms the disaccharide lactose.
The empirical formula for maltose is C12H22O11, for sucrose it is C12H22O11, and for lactose it is C12H22O11. This means that all three sugars have the same empirical formula.
The chemical equation for lactose is C12H22O11. It is a disaccharide composed of glucose and galactose molecules bonded together.
To calculate the empirical formula from a molecular formula, divide the subscripts in the molecular formula by the greatest common factor to get the simplest ratio of atoms. This simplest ratio represents the empirical formula.
Zinc's weight is 65.4, and Chlorine's weight is 35.5. Add the weight of the two chlorine atoms to one zinc atom. The resulting formula is ZnCl2.