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Copper is an excellent electrical conductor widely used in making electric circuits. In producing a printed circuit board for the electronics industry, a layer of copper is laminated on a plastic board. A circuit pattern is then printed on the board using a chemically resistant polymer. The board is then exposed to a chemical bath that reacts with the exposed copper, leaving the desired copper circuit, which has been protected by the overlaying polymer. Finally, a solvent removes the polymer. One reaction used to remove the exposed copper from the circuit board is $\mathrm{Cu}(\mathrm{s})+\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}(a q)+4 \mathrm{NH}_{3}(a q) \longrightarrow$ $2 \mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}(a q)$ A plant needs to produce 5000 circuit boards, each with a surface area measuring $2.0$ in. $\times 3.0$ in. The boards are covered with a $0.65-\mathrm{mm}$ layer of copper. In subsequent processing, $85 \%$ of the copper is removed. Copper has a density of $8.96 \mathrm{~g} / \mathrm{cm}^{3}$. Calculate the masses of $\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}$ $\mathrm{Cl}_{2}$ and $\mathrm{NH}_{3}$ needed to produce the circuit boards, assuming that the reaction used gives a $97 \%$ yield.

          Copper is an excellent electrical conductor widely used in making electric circuits. In producing a printed circuit board for the electronics industry, a layer of copper is laminated on a plastic board. A circuit pattern is then printed on the board using a chemically resistant polymer. The board is then exposed to a chemical bath that reacts with the exposed copper, leaving the desired copper circuit, which has been protected by the overlaying polymer. Finally, a solvent removes the polymer. One reaction used to remove the exposed copper from the circuit board is
$\mathrm{Cu}(\mathrm{s})+\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}(a q)+4 \mathrm{NH}_{3}(a q) \longrightarrow$
$2 \mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}(a q)$
A plant needs to produce 5000 circuit boards, each with a surface area measuring $2.0$ in. $\times 3.0$ in. The boards are covered with a $0.65-\mathrm{mm}$ layer of copper. In subsequent processing, $85 \%$ of the copper is removed. Copper has a density of $8.96 \mathrm{~g} / \mathrm{cm}^{3}$. Calculate the masses of $\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}$ $\mathrm{Cl}_{2}$ and $\mathrm{NH}_{3}$ needed to produce the circuit boards, assuming that the reaction used gives a $97 \%$ yield.

Added by Ricardo S.

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