Re: What is the chemical forumla for active dry yeast?

Yeast is not a chemical and has no chemical formula.  Try looking at yeast 
as a single cell, similar to any single cell in your body.  Those cells 
are made up of numerous types and classifications of chemicals.  Some are 
very simple, like water.  Others are extremely complex, like proteins.  In 
the very complex protein molecules their chemical composition is only a 
small part of the functionality equation, since many chemicals might have 
the same ratios but the way they are put together and folded into three 
dimensional strucutures is what dictates their activities.

If you are looking for the conversion of sugars to water and carbon 
dioxide the basic cycle is well known and established.  I suggest you 
check out a basic organic or biochemistry book from your school library 
and read up on it.