Question

In what state does ${\mathrm{BeCl}}_2$ in vapour phase exists below $900$degree Celsius?

Answer 1

Beryllium chloride:

• Beryllium chloride is an inorganic chemical having the formula ${\mathrm{BeCl}}_2$.
• It is a colourless, hygroscopic solid that dissolves readily in a wide range of polar solvents.
• The vapour phase, ${\mathrm{BeCl}}_2$ is a combination of monomer ${\mathrm{BeCl}}_2$ and dimer ${\mathrm{Be}}_2{\mathrm{Cl}}_4$.

Monomer:

• A monomer is a simple molecule having two or more binding sites that create covalent bonds with other monomer molecules to produce a macromolecule.
• All simple molecules cannot operate as monomers; only those with two or more bonding sites may.

Dimer:

A dimer is an oligomer composed of two monomers linked together by bonds that might be strong or weak, covalent or intermolecular.

Thus, ${\mathrm{BeCl}}_2$exist as both dimer and monomer in the vapour phase exists below $900$degree Celsius.