Modern pennies are composed of zinc and coated with copper, Ask an Expert

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Modern pennies are composed of zinc and coated with copper. After making several scratches in a penny, a student determines the mass of a penny to be 2.482g. The student puts the penny into hydrochloric acid, where the zinc (but not the copper) reacts with hydrochloric acid via a single replacement reaction. The hydrogen is collected at 25 degrees Celsius over water. The collected gas occupies 0.899L at a total pressure of 791mm Hg. Calculate the percent zinc (by mass) in the penny. (Assume that all of the zinc in the penny dissolves.)

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Category:- Chemistry
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