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26 Nov 2019

The zinc within a copper-plated penny will dissolve in hydrochloricacid if the copper coating is filed down in several spots (so thatthe hydrochloric acid can get to the zinc). The reaction betweenthe acid and the zinc is:
Zn (s) + 2 HCl (aq) ZnCl2 (aq) + H2 (g)
When the zinc in a certain penny dissolves, the total volume of gascollected over water at 25.0

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Jamar Ferry
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22 Jan 2019

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Related questions

Small quantities of hydrogen gas can be prepared in the lab by addition of hydrochloric acid to zinc. The gas is typically collected over water (what does collected over water mean?). What volume of hydrogen can be collected from 0.625g Zn? The total pressure is 784torr at 30oC. Water has a vapor pressure of 32torr at 30oC.

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a) 30mL b) 157mL c) 240mL d) 316mL e) 564mL

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