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 Thebooedocksaint
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 Growery I don't normaly ask for help 
#488797 - 10/17/10 12:11 PM (14 years, 1 month ago) |
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for homework, but I'm honestly stumped; it's in chemistry.
The problem is from the gas laws chapter. Here is the problem, you don't have to give me the answer. Just describe what gas equations I'm going to be using.
I'll probably figure it out in a little bit, but I missed the first lecture of this chapter.
A 2.5L flask at 15*C contains a mixture of N2, He, and Ne with partial pressures of .32atm for N2, .15atm for He, and .42atm for Ne.
Calculate the volume in liters at STP occupied by He and Ne if the N2 is removed.
-Edited for subscripts-
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"Je pense, donc je suis (I am thinking, therefore I am)." -Rene Descartes
Edited by Thebooedocksaint (10/17/10 12:20 PM)
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NizzyJones
Fight Evil with Funk
Registered: 08/18/10
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Re: Growery I don't normaly ask for help [Re: Thebooedocksaint]
#488852 - 10/17/10 01:33 PM (14 years, 1 month ago) |
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Jesus it's been a long time since I've used gas laws. Looks like an Avagadro and ideal gas law problem though since nothing remains constant. Just remember the ideal gas law uses temperatures in Kelvin.
V = (nRT)/p
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SmOakland
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Re: Growery I don't normaly ask for help [Re: NizzyJones]
#488854 - 10/17/10 01:39 PM (14 years, 1 month ago) |
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Yeah just use that equation PressurexVolume=number of particlesxRxtemperature to find the number of each species and then use it again to calculate the stp for the He and N2.
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Thebooedocksaint
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Re: Growery I don't normaly ask for help [Re: SmOakland]
#488889 - 10/17/10 03:03 PM (14 years, 1 month ago) |
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so to make moles the subject of the equation would it be something like PV/RT=n?
Luckily the answer is in the back of the book so I will know when I have it set up right. got annoyed and ended up gettin blaze and watching the history channel.
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"Je pense, donc je suis (I am thinking, therefore I am)." -Rene Descartes
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Thebooedocksaint
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Re: Growery I don't normaly ask for help [Re: Thebooedocksaint]
#488898 - 10/17/10 03:19 PM (14 years, 1 month ago) |
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Oh,I just read the line in my book I wasn't aware of.
Molar volume of a gas at STP = 22.41L that helps a lot.
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"Je pense, donc je suis (I am thinking, therefore I am)." -Rene Descartes
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Shaggy420
Registered: 07/06/10
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Re: Growery I don't normaly ask for help [Re: Thebooedocksaint]
#488909 - 10/17/10 04:54 PM (14 years, 1 month ago) |
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 i feel un-intelligent
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SmOakland
Now with Grow!
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Re: Growery I don't normaly ask for help [Re: Thebooedocksaint]
#488911 - 10/17/10 04:57 PM (14 years, 1 month ago) |
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Quote:
Thebooedocksaint said:
Oh,I just read the line in my book I wasn't aware of.
Molar volume of a gas at STP = 22.41L that helps a lot.
You dont need to memorize that. You can get it using the pv=nrt equation just plug in one mole, 1 atm, 298 degrees c and you will get that vol. you will figure it out gas law shit is easy.
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 iStoner
Astral Beast
Registered: 06/09/10
Posts: 7,176
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Re: Growery I don't normaly ask for help [Re: Shaggy420]
#488916 - 10/17/10 05:10 PM (14 years, 1 month ago) |
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Quote:
TrippyStoner420 said:
i feel un-intelligent
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NizzyJones
Fight Evil with Funk
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Re: Growery I don't normaly ask for help [Re: SmOakland]
#488922 - 10/17/10 05:32 PM (14 years, 1 month ago) |
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Quote:
SmOakland said:
Quote:
Thebooedocksaint said:
Oh,I just read the line in my book I wasn't aware of.
Molar volume of a gas at STP = 22.41L that helps a lot.
You dont need to memorize that. You can get it using the pv=nrt equation just plug in one mole, 1 atm, 298 degrees c and you will get that vol. you will figure it out gas law shit is easy.
Yeah it's nearly all just the algebra, playing with that equation.
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drawde
Registered: 11/15/09
Posts: 5,268
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Re: Growery I don't normaly ask for help [Re: NizzyJones]
#488941 - 10/17/10 06:24 PM (14 years, 1 month ago) |
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Why wouldn't it just be 2.5 L if its in a defined container. But I guess the pressure could be too little for the gas to occupy the whole space?
I tried to think of the equations for this that I studied the hell out of like a month ago and you think I can remember...
I need to lay off the pipe. 
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King Koopa said:
The amount of pot that Gask smokes is equivalent to a guy shooting heroin on weekends
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Thebooedocksaint
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Re: Growery I don't normaly ask for help [Re: drawde]
#489145 - 10/18/10 09:45 AM (14 years, 1 month ago) |
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I ended up being about .30 L off, but it was probably due to all the estimating I I did. I just used .08 for R.
Apparently it was due friday, kinda pissed me off some because I sure didn't know.
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"Je pense, donc je suis (I am thinking, therefore I am)." -Rene Descartes
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SmOakland
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Re: Growery I don't normaly ask for help [Re: Thebooedocksaint]
#489179 - 10/18/10 02:03 PM (14 years, 1 month ago) |
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Quote:
Thebooedocksaint said:
I ended up being about .30 L off, but it was probably due to all the estimating I I did. I just used .08 for R.
Apparently it was due friday, kinda pissed me off some because I sure didn't know.
look up your appropriate gas constant. you are not supposed to round those.
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Thebooedocksaint
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Re: Growery I don't normaly ask for help [Re: SmOakland]
#489626 - 10/19/10 10:48 PM (14 years, 1 month ago) |
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Haha, just checked my grades. 12.6/12.5 for the last test.
Thank god, I need as many A's as I can to bring my GPA up as much as I can.
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"Je pense, donc je suis (I am thinking, therefore I am)." -Rene Descartes
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lucas_southoz
Australian
Registered: 08/28/10
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Re: Growery I don't normaly ask for help [Re: iStoner]
#489631 - 10/19/10 11:03 PM (14 years, 1 month ago) |
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Quote:
iStoner said:
Quote:
TrippyStoner420 said:
i feel un-intelligent
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Burbles
Registered: 05/24/08
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Re: Growery I don't normaly ask for help [Re: lucas_southoz] 1
#489635 - 10/19/10 11:27 PM (14 years, 1 month ago) |
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pv=nrt
pronounced piv nert
Helps you remember it. Pretend its a name 
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Thebooedocksaint
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Re: Growery I don't normaly ask for help [Re: Burbles]
#489702 - 10/20/10 09:06 AM (14 years, 1 month ago) |
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Turns out I was supposed to do P1V1/T1=P2V2/T2
I'm glad I'm taking algebra (for the third time) this spring. Having a choice to skip or not is to tempting with that class. But next semester I don't have any choice to pass or not, I need every one of my classes.
Looks like I'm not even starting my education courses until I get to KState.
Does anyone know how much extra time adding an extra Minor takes?
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"Je pense, donc je suis (I am thinking, therefore I am)." -Rene Descartes
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NizzyJones
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Re: Growery I don't normaly ask for help [Re: Thebooedocksaint]
#489804 - 10/20/10 02:39 PM (14 years, 1 month ago) |
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Depends on how well you can work it into your other requirements.
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Thebooedocksaint
Dead Dictator
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Re: Growery I don't normaly ask for help [Re: NizzyJones]
#489828 - 10/20/10 04:28 PM (14 years, 1 month ago) |
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Well I completely am fine with taking longer.
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"Je pense, donc je suis (I am thinking, therefore I am)." -Rene Descartes
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