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Home Q & A Board Laboratory Help Introductory Courses
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smiley13 smiley13
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10 years ago
In my chem class we are doing a lab where we must find the mole percent oxygen in air saturated with water vapor and air from which the water vapor has been removed.

First of all, what exactly is mole percent oxygen?
Secondly, If we have the initial pressure, volume, temperature, and the final pressure and temperature, how do you find the mole percentages??
I'm pretty sure you do an initial final problem to find the final pressure....
Rightwards Arrow (PV) / (nT) =  (P2V2) / (n2T2)  
but then what??

the lab involved filling the burette with a little more than 10 mL of water and then adding 5mL of CoCl(sub2) and 6 mole NH(sub3)
this mixture was placed stopper down into a large container of water for a while to allow the solution to react with the oxygen. Then the stopper was taken out (under the water so the air was still trapped in the burette) and the volume of the gas was remeasured (it was smaller than the initial (the pressure had gone down from the reaction)

Thanks!
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darkwinddarkwind
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10 years ago
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