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Mass of polysaccharides

  1. Nov 6, 2017 #1
    Hey guys. When a polysaccharide (e.g. starch) is made I understand that monosaccharides are linked together and a water molecule is removed. In the final product the polysaccharide has a mass of n times its empirical formula plus a water molecule. Like the mass of 300 starches from 300 glucose molecules is 300(C6H10O5) + H2O. Why is this?
  2. jcsd
  3. Nov 6, 2017 #2
    I think you mean why a starch molecule from 300 glucose molecules is 300(C6H10O5) + H2O.

    Because the water from each molecule has already been subtracted [the molecule of monomer was initially (C6H12O6)]. You must add one water molecule because the polymer has an -OH in the one end and -H in the other end.
  4. Nov 7, 2017 #3


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    Staff: Mentor

    It is all in the structure - just count the atoms:

  5. Nov 7, 2017 #4
    Thanks guys you were extremely helpful!
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