1. Given the reaction:        2 Al (s) +  6 HCl (aq)    -->   2 AlCl3 (aq) +   3 H2 (g) A strip of aluminum of unknown mass is reacted with excess hydrochloric acid.  When the hydrogen gas is collected over water, it is done so at a temperature of 22.0 oC and fills a flask of volume 43.8 mL.  The pressure inside the collection tube is 750.3 mmHg and the water vapor pressure at 22.0 oC is 19.83 torr.  Determine the mass of the aluminum strip in milligrams (mg). 2. What is the concentration of potassium nitrate (in molarity) at saturation if the mass solubility at 50 oC is 88 g KNO3 per 100 g water? 3. What is the partial pressure (in mmHg) of a 39.2% by mass a solution of propylene glycol (C3H8O2) dissolved in water at 96.0 oC?  The vapor pressure of pure water at 96.0 oC is 657.6 mmHg.   Assume the propylene glycol solution is an ideal solution.

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Author:Steven S. Zumdahl
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Chapter5: Gases
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1.

Given the reaction:

       2 Al (s) +  6 HCl (aq)    -->   2 AlCl3 (aq) +   3 H2 (g)

A strip of aluminum of unknown mass is reacted with excess

hydrochloric acid.  When the hydrogen gas is collected over

water, it is done so at a temperature of 22.0 oC and fills a

flask of volume 43.8 mL.  The pressure inside the

collection tube is 750.3 mmHg and the water vapor

pressure at 22.0 oC is 19.83 torr. 

Determine the mass of the aluminum strip in milligrams (mg).

2.

What is the concentration of potassium nitrate (in molarity) at saturation if the mass solubility at 50 oC is 88 g KNO3 per 100 g water?

3.

What is the partial pressure (in mmHg) of a 39.2% by mass a solution of

propylene glycol (C3H8O2) dissolved in water at 96.0 oC?  The

vapor pressure of pure water at 96.0 oC is 657.6 mmHg.  

Assume the propylene glycol solution is an ideal solution.

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