Explain how to get the mole of any compound

What is the overall order of reaction for rate = k[no]2[o2]

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.

0.2348 grams of pbcl2 used to form 44.0 ml of solution.