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26 Nov 2019

The most common source of copper (Cu) is the mineral chalcopyrite(CuFeS2). How many kilograms of chalcopyrite must be mined toobtain 355g of pure Cu?

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Related questions

Geoguay: "So how much of that super chunk chocolate is scoop of your super chunk chocolate ice cream?" Geogal "Well, in order to tell you I need to take a scoop of the ice cream and drop it on this weighing scale (splat), weigh it. pick out all those chocolate chunks and drop them on another weighing scale (thud), then take the weight of the chunks and divide by the weight of the scoop, multiply by 100 and there you have it: an eye-popping 42 percent (by weight) of super chunk chocolate in my super chunk chocolate ice cream" In lecture we talked about the importance of mineral resources in sustaining our society and that every American consumes about 9 kilograms, or 20 pounds, ofeopper per year. That figure is based on an estimate of the national demand for copper to make such things as electrical wire, tubing, and electronic components (to name just a few) divided by the US. population. Like other metals, the copper you use comes from minerals, which in turn are extracted from earth's crust. Remember from lecture that valuable minerals do not occur in large pockets of pure, solid masses but are widely dispersed throughout earth's crust and mined where geological processes have enriched their concentration. This homework problem will help you appreciate the value of metal in minerals and the volume of rock material that must be processed to meet your annual demand for copper. Back A common "ore" of copper is the mineral chalcopyrite. Chalcopyrite is often the principal ore mineral in "porphyry copper deposits" as presented in class. You have analyzed the physical properties of chalcopyrite in laboratory so you already know some things about it or where to go to refresh your memory. Chalcopyriteis a sulfide mineral so this means it contains more than just copper. In addition to sulfur (S), chalcopyrite contains some iron (Fe) and the proportions of these metals in the mineral are expressed by its chemical formula: CuFeS2. So how much copper (Cu), say by weight percent, is in chalcopyrite? Let's use another copper sulfide mineral as an example ofhow this calculation is made. How much copper is in the mineral chalcocite? Chalcocite is another ore mineral of copper. In order to determine this one needs to know the chemical formula and atomic hts of the included chemical elements. The chemical formula for chalcocite is Cu:S The atomic weight of the chemical elements C and S are 63.55 and 32.07, respectively (this info can be retrieved from a Periodic Ta of the Elements like the one lecture. This means that the chemical formula weight ofchalcocite i 2x63,55 (Cua) 32.07 (S) 159.17 grams (CuzS) and the weight percent of Cu in chalcocite is 127.10 (Cu) divided by 159.17 (Cu2S) x 100 79.85%

Can someone please show me a step by step explanation on how to solve this? The first picture is the information, mainly the (a) section, the second picture is the questions I need answered

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