I forgot this section but I got the rest plz help me

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

If two identical atoms are bonded,what kind of molecule is formed