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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Asked Sep 17, 2019
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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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Expert Answer

Step 1

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

Area 7.75cm x 16.5cm
127.875cm2
Volume Area x Thickness
127.875cm2 x 0.0320 cm
= 4.092cm3
4.092cm3 x12000
Plant has to manufacture 12000, then volume
- 49104 cm3
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Area 7.75cm x 16.5cm 127.875cm2 Volume Area x Thickness 127.875cm2 x 0.0320 cm = 4.092cm3 4.092cm3 x12000 Plant has to manufacture 12000, then volume - 49104 cm3

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Step 2

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

Mass of Cu Volume x Density
= 49104x8.96
439971.84 g
Mass of Cu removed = 439971.84 gx100
78
= 343178 g
Moles of Cu removed = 343178 g
63.546
5400.5 moles
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Mass of Cu Volume x Density = 49104x8.96 439971.84 g Mass of Cu removed = 439971.84 gx100 78 = 343178 g Moles of Cu removed = 343178 g 63.546 5400.5 moles

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