What is a very long molecule that has chemicals in a special order?

It will be a polymer

A polymer is a macromolecule which is obtained by repetitive combination of small molecules known as monomers.

When these monomers are combined in repetitive manner they form a long chain of small monomers or a very long molecule

Now in case of polymer also there is formation of bond between monomers which is possible only if they combine in a definite or special order.

Now here the answer can be very specific like

a) bio polymer : example : DNA , RNA , Protein, starch, cellulose

b) synthetic polymer: polyethylene, PVC

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o