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In the production of printed circuit boards for the electronics industry, a 0.715 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 8500 printed circuit boards, each 5.65cm x 11.0cm in area. An average of 85.0% of the copper is removed from each board (density of copper=8.96g/cm3.) What mass of Cu(NH3)4Cl2 reagent is required?
what mass of KO2 in grams is required to react with 8.90-L of CO2 at 22.0 C and 767mm Hg? first calculate the number of moles of CO2 (R=0.08026 L*atoms/ mol*K) find moles of Co2 and mass of KO2 in grams?
When atoms of the hypothetical element X are placed together, they rapidly undergo reaction to form the X2 molecule. Would you predict that this reaction is exothermic or endothermic?
what was the concentration of the nitric acid? Write the neutralization reaction, balance it, name the products THEN Solve the problem above
Propose mechanisms for the formation of fragments with m/z 69, 43 and 41 in the mass spectra of CH3CH=CHC(O)CH3 and briefly explain the absence of fragments from the McLafferty rearrangement.
what change in the number of moles of Ag occurs in the system? (2)what change in the concentration of Ag occurs in the system?
Determine the number of significant digits in each number and write out the specific significant digits.
Ascorbic Acid (Vitamin C) is diprotic acid (Ka1= 8.00x10^-5 and Ka2= 1.60x10^-12). What is the pH of a 0.250M solution of ascorbic acid?
For the following pairs of orbitals, indicate which orbital is lower in energy, and give a brief explanation why. a) sulfur 3p vs. sulfur 3d
A gas containing H2S and CO2 is bubbled through methanol at 4 degrees C. From the bottom of the tank to the top, 80% of the H2S is absorbed by the methanol.
Why do you put sodium carbonate in sulfanilic acid. What form is the sulfanilic acid? Why do you put HCl in ice?
How much heat is required to heat 410g of copper from 25degree C to 200degree C?
In the laboratory you are asked to make a 0.648 m cobalt (II) bromide solution using 350 grams of water. How many grams of cobalt (II)
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