In the production of printed circuit boards for the electronics industry, a 0.60-mm layer of copper is laminated onto an insulating plastic board. Next, a circuit pattern made of a chemically resistant polymer is printed on the board. The unwanted copper is removed by chemical etching and the protective polymer is finally removed by solvents. One etching reaction is
Cu(NH3)4Cl2(aq) + 4NH3(aq) + Cu(s) → 2Cu(NH3)4Cl(aq)
A plant needs to manufacture 10,000 printed circuit boards, each 8.0 × 16.0 cm in area. An average of 80% of the copper is removed from each board (density of copper 58.96 g/cm3). What masses of Cu(NH3) 4Cl2 and NH3 are needed to do this? Assume 100% yield.