In the production of printed circuit boards for

Chapter 3, Problem 3.86

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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) 1 4NH3(aq) 1 Cu(s) 88n 2Cu(NH3)4Cl(aq) A plant needs to manufacture 10,000 printed circuit boards, each 8.0 3 16.0 cm in area. An average of 80.% of the copper is removed from each board (density of copper 5 8.96 g/cm3). What masses of Cu(NH3)4Cl2 and NH3 are needed to do this? Assume 100% yield.

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