Pcl3 compound stable but don't follows octet rule what is the reason behind? ​

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

Define dew point. i am writing this part to be able to ask the question

What is the molecular weight of copper