Calculate the percent zinc in the penny. (Assume that all the in the penny dissolves.)?

Modern pennies are composed of zinc coated with copper. A student determines the mass of a penny to be 2.485 and then makes several scratches in the copper coating (to expose the underlying zinc). The student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the (the copper remains undissolved):

Volume of H2 evolved = 901 cm^3

So, moles present = (901/1000)/24
= 0.0375 moles.

So, moles of zinc present = 0.0375 moles

So, mass of zinc present = 65 x 0.0375
= 2.438 grams

So, percentage zinc = (2.438/2.485) x 100%
=98.11%

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