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July 22, 2014

Homework Help: Chemistry

Posted by Sandy on Thursday, December 13, 2012 at 1:56am.

When 0.40 g of impure zinc reacted with an excess of hydrochloric acid, 127 mL of hydrogen was collected over water at 10 degress C The external pressure was 737.7 Torr.

a) What volume would the dry hydrogen occupy at 1.00 atm and 298 K ?

b) What amount (in moles) of H2 was collected?

c) What is the percentage purity of the zinc, assuming that all the zinc present reacted completely with HCl and that the impurities did not react with HCl to produce hydrogen? The vapor pressure of water at 10 degrees C is 9.21 Torr.

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