A copper-aluminum alloy has an aluminum concentration of (5.19x10^2) kg/m3.If the densities of aluminum and copper are 2.71 and 8.94 g/cm3, respectively, what is the concentration of aluminum in wt%?Could someone please help wit this question, im lost
Densities: Aluminum: 2,710 kg/m^3 Copper: 8,940 kg/m^3 Basis: 1 m^3 of copper-aluminum alloy mass of aluminum in 1 m^3 alloy = 519 kg vol. of aluminum in the 1 m^3 alloy = 519 kg/(2710 kg/m^3) = 0.1915 m^3 vol. of copper in 1 m^3 alloy = 1 m^3 - 0.1915 m^3 = 0.8085 m^3 mass of copper in 1 m^3 alloy = (0.8085 m^3)*(8,940 kg/m^3) = 7,227.87 kg mass of the m^3 alloy = 7,227.87 kg + 519 kg = 7,746.87 kg %weight of aluminum = (519 kg/7,746.87 kg)*100% = 6.70% The alloy has 6.70% by weight of aluminum in it.
