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Review | Constants | Part A Modern American pennies are composed of zinc coated with copper. A student determines the mass of a penny to be 2.484 g and then makes several Assuming that all the Zn in the penny dissolves, calculate the percent zinc by mass in the penny. scratches in the copper coating (to expose the underlying zinc). The student puts the scratched penny in hydrochloric acid, where the following AEd d 2 ? reaction occurs between the zinc and the HCI (the copper remains undissolved): % Zn(s) + 2 HCl(aq) - H2(g) + ZnCl2 (aq) The student collects the hydrogen produced over water at 25 . C. The collected gas occupies a Submit Request Answer volume of 0.903 L at a total pressure of 787 mm Hg . Provide Feedback