2 HCl + Na2SO4 --> 2 NaCl + H2SO4 If you start with 28.2 grams of hydrochloric acid (HCl), how many grams of sodium chloride (NaCl) will be produced?

Since there is the same amount of agn03 in both silver chloride and silver nitrate they produce the same amount of moles. therefore silver chloride produces the same amount of silver nitrate, so your answer is 15.0 moles of silver nitrate. i hope this !

It will appear as o2(g) as a reactant 

Polyethylene is a strong synthetic polymer that can be used to make toys and bottles. polyethylene is a plastic material called thermoplastic. one very useful property of thermoplastic is that when it is heated it turns into liquid, which can be molded into desired shape and size. also the material do not dissolve at room temperature.