Copper refining traditionally involves "roasting" insoluble sulfide ores (CuS)(CuS) with oxygen. Unfortunately, the process produces large quantities of SO2(g)SO2(g), which is a major contributor to pollution and acid rain. An alternative process involves treating the sulfide ore with HNO3(aq)HNO3(aq), which dissolves the CuSCuS without generating any SO2SO2. The unbalanced chemical equation for the reaction is given below. CuS(s) + NO3_(aq)> Cu2+(aq) + NO(g) + HSO4_(aq) (not balanced) What volume of concentrated nitric acid solution is required per kilogram of CuS? Assume that the concentrated nitric acid solution is 70% HNO3 by mass and has a density of 1.40g/ml.