If the products in a chemical equation include h2o, what specific type of reaction is occuring? is a polymer being made or broken down in this equation?

There are two kinds of polymers : addition polymers and condensation polymers

In case of addition polymers, there is simple addition of unsaturated monomeric units. example: polythene

While in case of condensation polymers, the monomers combine with the elimination of a small molecule like H2O, HCl, NH3 etc.

So here as there is formation of H2O as product there is formation of a polymer and that too a condensation polymer

Example: condensation polymer of diamine and dicarboxylic acid to form a polyamide (Nylon-6,6)

condensation

formation of polymer

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"