February 26, 2017

Homework Help: AP Chemistry

Posted by Kate on Sunday, April 3, 2011 at 2:28pm.

A mixture of aluminum and zinc metal is used in 2 experiments described below:

A- A 1.7 gram sample of the mixture is reacted with excess hydrochloric acid and the resulting hydrogen gas is collected over water. The reaction takes place at 750 mm Hg atmospheric pressure and 25C. VP of water = 23.8 torr.

B- In a separate experiment, 1.4 grams of the mixture is reacted with a stoichiometric quantity of hydrochloric acid. The resulting solution is treated with a concentrated ammonia solution. A precipitate forms that is collected and dried. The mass of the precipitate is 2.70 gms.

Calculate the volume of the hydrogen gas collected in A.

Any help would be appreciated, even if it is just where to start

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