First, we have to notice that the mass given was for an impure substance containing copper. This means that we have to use mass % to calculate the mass of copper.
Apply the formula to the problem then rearrange to isolate mass of Cu (Copper)
Copper can be drawn into thin wires. How many meters of 34-gauge wire (diameter = 6.304 x 10−3 in) can be produced from the copper in 5.01 lb of covellite, an ore of copper that is 66% copper by mass? (Hint: Treat the wire as a cylinder: V of cylinder = πr2h; d of copper = 8.95 g/cm3.)
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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.