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What mass of chalcocite would contain the same mass of copper as is contained in 418 pounds of chalcopyrite
Accepted Answer
Here's how to calculate the mass of chalcocite needed:
1. Find the copper content:
Chalcopyrite (CuFeS2) has a molar mass of 183.52 g/mol, with copper accounting for 63.55 g/mol out of that.
Calculate the mass fraction of copper in chalcopyrite: (63.55 g/mol) / (183.52 g/mol) = 0.346
Therefore, 418 pounds of chalcopyrite contains 418 pounds
0.346 = 144.7 pounds of copper.
2. Calculate the chalcocite mass:
Chalcocite (Cu2S) has a molar mass of 159.16 g/mol, with copper accounting for 2
63.55 g/mol = 127.1 g/mol.
Calculate the mass fraction of copper in chalcocite: (127.1 g/mol) / (159.16 g/mol) = 0.800
The mass of chalcocite containing 144.7 pounds of copper is 144.7 pounds / 0.800 = 180.9 pounds.
Therefore, 180.9 pounds of chalcocite would contain the same mass of copper as 418 pounds of chalcopyrite.
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