How much chalcopyrite had to be mined to produce 100 pennies if reaction 1 had a percent yield of 64.00 % and all other reaction steps had yield of 100%?

Explanation:

Hello,

During this process, the following chemical reactions are carried out:

Now, a typical penny, has about 3.0 g of copper, it means that 100 pennies have 300 g of copper, thus, we develop the following stoichiometric procedure to determine the sulfur that is consumed in the 4th reaction, because in the third one it is produced:

Since the percent yield for the second, third and fourth chemical reactions is 100%, we now proceed to the third reaction to compute consumed cupric sulfide since it is produced in the first chemical reaction, thus:

Finally, by using the first chemical reaction and the percent yield (represented by the by-moles relationship of cupric sulfide), one computes the required mass of chalcopyrite () with a molecular mass of 183.54g/mol considering the first chemical reaction:

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explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.