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A penny is composed of zinc (97.5%), plated with copper (2.5%), and weighs 2.500g. Hydrochloric acid reacts with zinc but not with copper to form hydrogen gas (H2) and zinc chloride (ZnCl2). A penny with a scored edge allows the HCl to react with the internal zinc metal, leaving a shell of unreacted copper. How many moles of hydrogen gas are formed by reacting a penny with excess HCl?

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Category:- Chemistry
Reference No.:- M9463961

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