Answer:
It is a trimer of molecular formaldehyde.
Explanation:
Paraformaldehyde, with the formula HO(CH2O)nH. ... A saturated water solution, of about 40% formaldehyde by volume or 37% by mass, is called "100% formalin". A small amount of stabilizer, such as methanol, is usually added to suppress oxidation and polymerization.
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