What is the structural formula of carbohydrates? I am so confused. I searched for this answer many times, and I always find a different answer. Please help me because I have an oral presentation describing carbohydrates. I found all that I need except for this question.

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You can check out the following site, which includes a video clip with an "inside view" of a glucose molecule. Hope this helps.

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Carbohydrates are one of four types of macromolecules that are essential to life.  They include sugars and starches.  The reason you are finding conflicting answers when you search is that there are several types of carbohydrates and each one has its own structural formula.  

The structural formula of a chemical describes (in a drawing, not words) how the atoms of the molecule are combined in that particular substance.  If all carbohydrates had the same structural formula, it would mean that there was only one type of carbohydrate.  So, even if more than one type of carb. shares the same chemical components (for example fructose, glucose, and galactose share the chemical formula C6H12O6) each one will be put together in a different way.

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Carbohydrates, as the name imples, are composed of carbon and water.  The empirical formula for most of them is:

Cx(H2O)y

where x and y are integer numbers of carbon atoms and water molecules, although some carbohydrates deviate from the strict hydrogen to oxygen ratio.   Most carbohydrates have the suffix -ose on the end of their names, and this large class of molecules includes sugars, starches, and cellulose, and are components of DNA, RNA, and ATP.  The most common carbohydrate is the sugar glucose, which has a structural formula of C6H12O6

Encyclopedia Britannica, 11th ed., vol. 5, pg. 304.

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