In the production of printed circuit boards for the electronics industry, a 0.320 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 isCu(NH3)4Cl2(aq) + 4NH3(aq) + Cu(s) → 2Cu(NH3)4Cl(aq)A plant needs to manufacture 12000 printed circuit boards, each 7.75cm x 16.5cm in area. An average of 78.0% of the copper is removed from each board (density of copper=8.96g/cm3.) What mass of Cu(NH3)4Cl2 reagent is required?

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In the production of printed circuit boards for the electronics industry, a 0.320 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 12000 printed circuit boards, each 7.75cm x 16.5cm in area. An average of 78.0% of the copper is removed from each board (density of copper=8.96g/cm3.) What mass of Cu(NH3)4Cl2 reagent is required?

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Step 1

First the volume of Cu is calculated which then used to determine the mass of Cu.

Step 2

Mass of copper removed from board is determined next, which then used to calculate the mass of Cu(NH3)4Cl2. Finally,...

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