What are the compounds for the chemical formula B4S

If this equation was completed which statement would it best support

Achemist 16 drop copper metal from copper chloride solution. the chemist place is 0.50 g of aluminum foil in a solution containing 0.75 g of copper (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction?

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.