Brass is an alloy of Cu-Zn. A sample of brass weighing 6g when treated with excess of dil H2SO4 gives 328mL of dry hydrogen gas at 27◦C and 760mm Hg pressure. What is the % of copper by weight in the alloy? (Atomic mass of zinc is 65.4g, R= 0.082L atm K-1 mol-1)
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