What phase is carbon dioxide in at 5 atm pressure and -20 C

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?

Salt in oceans comes from and of rocks

Balance the following reaction. as2s3 + 9o2 → 2as2o3 + so2