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Equilibrium. help please

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DailyCommute
Posts: 56 - Karma: 11
A closed, nonreactive system contains species 1 and 2 in vapor/liquid equilibrium. Species 2 is
a very light gas, essentially insoluble in the liquid phase. The vapor phase contains both species 1
and 2. Some additional moles of species 2 are added to the system, which is then restored to its
initial T and P. As a result of the process, does the total number of moles of liquid increase,
decrease, or remain unchanged?
Feb 15 2011 11:06PM
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Jordan
Posts: 4079 - Karma: 2,122
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Feb 15 2011 11:07PM
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Master_Debater
Posts: 1211 - Karma: 225
try yahoo answers dood.
Feb 15 2011 11:08PM
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DailyCommute
Posts: 56 - Karma: 11
yeah i tried. answer got deleted
Feb 15 2011 11:10PM
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Chokolite
Posts: 1050 - Karma: 23
unchanged. it's insoluable in liquid so adding more would not increase the total number of moles in the liquid.
Feb 15 2011 11:13PM
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notomatoplz
Posts: 1377 - Karma: 29
"T" is temp. and 'P' is pressure?
Feb 15 2011 11:13PM
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DailyCommute
Posts: 56 - Karma: 11
yeah i was thinking the same thing but the system is in equilibrium and needs to stay in equilibrium. i thought it was increase so that the mol/mol ration between vapor and liquid would remain 50/50.  I talked to some kid and he said the TA said it was decrease, but gave no explanation.
Feb 15 2011 11:14PM
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jibjim
Posts: 1814 - Karma: 10
i think by definition it has to. you're adding mass to the system. That mass should be distibured equally between the vapour and liquid


and this is like university thermodynamics dude.. try an engineering forum or something
Feb 15 2011 11:15PM
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Obi-Wan-Jenobi
Posts: 951 - Karma: 119
no the liquid will increase because its in phase equilibrium with the liquid, since you added an excess of gas, some of that gas will change to liquid to preserve the eqilibrium, thus slightly increaseing the concentration of the liquid. maybe i think its been a year since i did chem 30
Feb 15 2011 11:18PM
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DailyCommute
Posts: 56 - Karma: 11
but i think that since species 2 is insoluble in the liquid phase that rule is altered.
Feb 15 2011 11:31PM
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Mr.Gaga
Posts: 2021 - Karma: 542

its high school chemistry loll

it will increase

Feb 15 2011 11:32PM
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Obi-Wan-Jenobi
Posts: 951 - Karma: 119

yes but souluability isnt the point. its a phase equilibrium

Feb 15 2011 11:48PM
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Ronald_Ray.Gun
Posts: 53 - Karma: 12
ya its this^
Feb 15 2011 11:53PM
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Owl
Posts: 1236 - Karma: 22
No change because neither is aqueous
Feb 15 2011 11:54PM
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Bubba-Snax
Posts: 541 - Karma: 11
[img]http://media.photobucket.com/image/homework%20-%20it%20will%20kill%20you%20in%20the%20end/Kir4/Blog%20Pictures/Homework.jpg?o=1[img]
Feb 16 2011 12:01AM
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DailyCommute
Posts: 56 - Karma: 11
you would be surprised. they wouldn't tell you that for no reason. the answer is supposed to be decreasing. so its not as obvious as it seems. i just dont know how thats the answer.
Feb 16 2011 12:06AM
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panojibber
Posts: 3382 - Karma: 216
Just to remind you... The liquid doesn't have to dissolve the gas for the gas to become liquid. They don't necessarily have to mix. I'd say its going to result in more liquid due to the fact that the system will naturally try to return to a lower pressure. You can basically just ignore the liquid species - if they're not reacting then it won't matter. And it's asking you if the moles of LIQUID increases or decreases... Not the moles of species 1/2.
Feb 16 2011 1:33AM
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Jahaws
Posts: 632 - Karma: 508
Just did this in chem class today, except I didn't pay attention. Sorry I'm no help.
Feb 16 2011 1:40AM
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Jahaws
Posts: 632 - Karma: 508
Just did this in chem class today, except I didn't pay attention. Sorry I'm no help.
Feb 16 2011 1:40AM
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TMiller
Posts: 444 - Karma: 7
I have a chem test on dis shit in like 3 periods.  I am gonna fail
Feb 16 2011 8:34AM
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a_pla5tic_bag
Posts: 9215 - Karma: 5,398
i have chem lab at like 12 today. hopefully i'm doing something cool.
Feb 16 2011 8:46AM
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moonofendor
Posts: 1484 - Karma: 14

decrease, because when you add species 2 none of it will become a liquid, but for the pressure and temperature to remain the same the volume of vapor has to be increased, therefore the volume of the liquid is decreased.

Feb 16 2011 8:47AM
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TechnoPotamus
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Feb 16 2011 8:54AM
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justinetherock
Posts: 2 - Karma: 11
The number of moles in the liquid phase decreases (the teacher told me so).

Here is the reason why (I think): The system must adjust to the new equilibrium, which now contains more moles of species 2 in the vapor phase. The decrease in the total number of moles in the liquid phase is therefore a consequence of the addition of additional quantity. Even if species 2 is insoluble in the liquid phase, it does not mean that it will not become liquid; the system will attempt to return to a lower pressure to restore equilibrium. It is essential to be cautious since the question does not concern the increase in liquid of one species or the other but rather the increase or decrease in the total moles of the liquid phase.
Feb 5 2024 12:46PM
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justinetherock
Posts: 2 - Karma: 11
The number of moles in the liquid phase decreases (the teacher told me so).

Here is the reason why (I think): The system must adjust to the new equilibrium, which now contains more moles of species 2 in the vapor phase. The decrease in the total number of moles in the liquid phase is therefore a consequence of the addition of additional quantity. Even if species 2 is insoluble in the liquid phase, it does not mean that it will not become liquid; the system will attempt to return to a lower pressure to restore equilibrium. It is essential to be cautious since the question does not concern the increase in liquid of one species or the other but rather the increase or decrease in the total moles of the liquid phase.
Feb 5 2024 12:46PM
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