Aluminum reacts with hydrochloric acid, but copper does not
react with the acid. When a mixture of aluminum and copper having a
mass of 0.3579 grams is combined with excess hydrochloric acid,
315.50 mL of hydrogen gas, measured over water, is generated. The
temperature at the time of collection is 27.3 oC (vapor
pressure of water at 27.3 oC = 27.214 torr), and the
total pressure in the collection container is 764.1 torr. Determine
the mass percentage of aluminum in...