In the production of printed circuit boards for the electronics industry, a 0.60-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
A plant needs to manufacture 10,000 printed circuit boards, each in area. An average of of the copper is removed from each board(density of copper ).What masses of and are needed to do this? Assume yield.
Masses of and required to remove copper from each board are and .
The mass of any material expressed in atomic mass units is quantitatively equivalent to its molar mass in grams per mole.
For 10,000 plates, the volume of copper coated
Amount of copper removed
Thus, from the given reaction,
For 1 mole of etching , 1 mole of is needed
Thus the required mass of
For 1 mole of , 4 moles of Ammonia is needed
And for etching, of ,
Moles of is needed.
Therefore, the masses of and are and .
Question: A sample of liquid heptane (C7H16) weighing 11.50 g is reacted with 1.300 moles of oxygen gas.The heptane is burned completely (heptane reacts with oxygen to form both carbon monoxideand water and carbon dioxide and water). After the reaction is complete, the amount of gas present is 1.050 moles (assume that all of the water formed is liquid). a. How many moles of CO are produced? b. How many moles of CO2 are produced? c. How many moles of O2 are left over?
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