Calculate the δhrxn for the following reaction:
ch4 (g) + 2cl2 (g) --> ch2cl2 (g) + 2hcl (g)
use the following reaction and given δh's:
ch4 (g) + cl2 (g) --> ch3cl (g) + hcl (g), δh = -99.60 kj
ch3cl (g) + cl2 (g) --> ch2cl2 (g) + hcl (g), δh = -105.8 kj

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?