List three ways in which the octet rule can sometimes fail to be obeyed

Based on the equation and the information in the table, what is the enthalpy of the reaction?

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.

What does an electron configuration for an atom relate to the atoms placement on the periodic table