What we can say about molecules is that they violates the law of definite proportions.
The law of definite proportions, also known as Proust's law or the law of constant composition, is a principle in chemistry that asserts a chemical compound will always contain its constituent components in a fixed ratio (by mass), regardless of its source or method of creation.
All molecules in the gaseous state and smaller molecular compounds in other states of matter are subject to the law of definite proportions, however polymers are exempt from its application. Even with identical monomers, the length, branching, termination, etc. of the polymer molecules varies significantly.
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