# In the production of printed circuit boards for the electronics industry, a 0.765 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 8700 printed circuit boards, each 7.55cm x 18.0cm in area. An average of 72.0% 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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Asked Sep 16, 2019
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In the production of printed circuit boards for the electronics industry, a 0.765 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 8700 printed circuit boards, each 7.55cm x 18.0cm in area. An average of 72.0% 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

Area of one board = 7.55 cm x 18 cm = 135.9 cm2.

Area of 8700 board = 8700 x 135.9 cm2 = 1182330 cm2.

Thickness of the board = 0.765 mm = 0.0765 cm

Total volume of the board = Area of 8700 board x Thickness of the board =1182330 cm2 x 0.0765 cm = 90448.2 cm3.

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