What is 72.9 g HCI into moles

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.

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

What is the molar mass of potassium nitrate, kno3