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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: integral0 on December 08, 2004, 03:02:21 PM

Title: law of combining volumes
Post by: integral0 on December 08, 2004, 03:02:21 PM

CO is oxidized to CO2 according to the equation, 2CO (g) + O2(g) --> 2CO2 (g).  If 2 L of CO(g) are mixed with 2 L of O2 (g), what is the resulting total volume of gas after the reaction has gone to completion, assuming no change in temperature or total pressure?



ANswer = 3L

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How did they come up with this answer?  I don't think I understand the "Law of combining volumes" as produced by Gay Lussac and Avogadro.  Any help is appreciated!

Title: Re:law of combining volumes
Post by: Demotivator on December 08, 2004, 03:14:27 PM

The volume is directly proportional to moles assuming ideal gases.
The limiting reactant is CO. When it completely reacts, 1 vol O2 is left over. 2 vols of CO2 are produced. Total is 3 Volumes.

Title: Re:law of combining volumes
Post by: integral0 on December 08, 2004, 03:21:19 PM

thanks man!  I own you one.  I'm staff here too, lol, just haven't been "here" in awhile.  Nice to meet you "Demotivator"

Title: Re:law of combining volumes
Post by: Donaldson Tan on December 08, 2004, 06:18:06 PM

all these are assumed that P & T are kept constant, and the gases behave ideally.