Answer
2.30 lb Cu
Work Step by Step
Note: the mass ratio in any units is the same as that deduced in amu or grams,e.g
63.55 amu Cu\div 183.54 amu CuFeS2 or 63.55 lb Cu\div 183.54 lb CuFeS2
? lb Cu= 6.63 lb CuFeS2\times 63.55 lb Cu\div 183.54 lb CuFeS2 = 2.2956= 2.30 lb Cu