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August 22, 2014

Homework Help: Chemistry

Posted by Tichele on Wednesday, January 19, 2011 at 10:33pm.

In an experiment, 238 mL of 0.45 molar hydrochloric acid completely reacts with excess iron to produce hydrogen gas and iron (III) chloride. What volume will the hydrogen gas occupy if it is collected over water at 35 degrees Celsius and 735 torr? The vapor pressure of water at 35 degrees Celsius is 42 mm Hg.

My work so far:
6HCl(aq) + 2Fe(s) ---> 3H2(g) + 2FeCl3(s)

Total pressure= Pressure of H2 + Pressure of H20
Solve for Pressure of H2:
Pressure of H2=Total pressure - Pressure of H20

Conversions:
Total Pressure= 735 torr X (1 atm/760 torr)=0.967 atm

Pressure of the water= 42mm Hg X (1atm/760 torr)=0.055atm

So...Pressure of H2= 0.967atm-0.055atm=0.912atm

I'm lost. I have no idea where to go next from here. Any help is greatly appreciated!

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