The internet is not helpful right now. How the heck do I do this? All I could find on Google were several very confusing pages and a few converters. I don't just want to know the number... need to figure out the process.

Yeah, yeah, chit chat isn't study hall #2

1/25/2010 10:34:06 PM

http://www.wolframalpha.com

you're welcome

[Edited on January 25, 2010 at 10:37 PM. Reason : idk then]

1/25/2010 10:34:48 PM

^ not helpful....

Quote :

"Result: ppm (parts per million) and micrograms per meter cubed are not compatible"

1/25/2010 10:37:02 PM

then you need another factor. like particle size/weight or something.

1/25/2010 10:38:22 PM

nope. you can go from one to the other, I just can't figure out how.

it would be with standard conditions - 298K and 1atm.

1/25/2010 10:39:39 PM

you need a unit of mass

1/25/2010 10:43:09 PM

^ yea that is why wolfram says they are incompatible.

1/25/2010 10:43:49 PM

please guys I have a match tonight

1/25/2010 10:56:39 PM

this is not possible without more information. you're trying to turn a percentage unto a unit, does not compute:


1 ppm is the same as .0001%

1ug/m^3 is 1ug/m^3

[Edited on January 25, 2010 at 11:12 PM. Reason : .]

1/25/2010 11:12:22 PM

^

1/25/2010 11:13:22 PM

http://tinyurl.com/yb5whs3

1/25/2010 11:17:37 PM

^^^ it is possible, or there wouldn't be this question in the book I'm reading... given a certain ppm and asked for the micrograms per cubic meter at 289k and 760 mmHg.

^ I've spent about 2 hours on google, but thanks.

[Edited on January 25, 2010 at 11:26 PM. Reason : ]

1/25/2010 11:25:33 PM

Quote :

" I've spent about 2 hours on google, but thanks."

if all those results on google didn't help you

i doubt these people are gonna be any help

1/25/2010 11:29:29 PM

^^ you are right it is possible... if you assume a mass of each part per million.

1/25/2010 11:32:47 PM

gotta have density at the temperature in question. Seeing's how I deal with oxygen concentration in boiler feed water on a regular basis I know these things. At the given pressure and temperature, no less...

1/25/2010 11:33:09 PM

ah, wolframalpha how I love thee

1/25/2010 11:33:21 PM

^^ yea if it is oxygen, but it could be lead or some random thing.

^ i just discovered it last semester now i <3 it so much.

[Edited on January 25, 2010 at 11:35 PM. Reason : /]

1/25/2010 11:34:15 PM

some one doesn't understand units. you need to know:

parts of something per million parts of something else

ie. particulates in a solution

1/25/2010 11:37:50 PM

why don't you give us the problem statement already

1/25/2010 11:39:48 PM

^^^ yes, i dont think i would have passed calculus without it. It was most helpful when i was check answers to see if I was doing things right

[Edited on January 25, 2010 at 11:40 PM. Reason : ^]

1/25/2010 11:40:09 PM

listen to Chop!

1/25/2010 11:44:50 PM

^^^ I did...

Quote :

"given a certain ppm and asked for the micrograms per cubic meter at 289k and 760 mmHg."

One question is for NO, one for NOx

[Edited on January 25, 2010 at 11:47 PM. Reason : ^s]

1/25/2010 11:46:21 PM

well, that's half the problem. i assume its talking about 1ppm NO in air

i'm gonna defer to others, i got to go to bed. good luck!

[Edited on January 25, 2010 at 11:51 PM. Reason : .]

[Edited on January 25, 2010 at 11:54 PM. Reason : .]

1/25/2010 11:50:39 PM

I don't know if you already got this or even care since it's 4:30 in the morning, but ppm is dimensionless where as you want an answer with units. this doesn't mean that you can't use units to express ppm. if you look at the wiki,

http://en.wikipedia.org/wiki/Parts-per_notation

you can see ppm can be expressed as mg/kg, which would be mg of one thing in kg of another. since i don't know the exact details of the problem, it seems you would want ug of NO in m3 of air as mentioned in another post. if you can convert mg of NO to ug of NO in the top half and use the ideal gas law to solve for density (n/v) to get a volume in the bottom half, you should be able to get an answer.

1/26/2010 4:49:14 AM

learning to work with units properly and learning to put them in my equations has made my homework much easier

1/26/2010 7:37:10 AM

Quote :

"given a certain ppm and asked for the micrograms per cubic meter at 289k and 760 mmHg."

Is not a problem statement. I'm guessing he wanted you to look at the problem in your book and type it out to us so we can read it without it having been filtered through you.

1/26/2010 8:07:26 AM

^ I didn't give all the info b/c I didn't want the problem solved for me, but here is almost all of it:

Quote :

"Convert ___ppm (vol.) NOx to micrograms per cubic meter at 25 degrees C and 760 mmHg."

1/26/2010 8:19:54 AM

need mass related information, such as density.

1/26/2010 8:23:37 AM

double the pleasure

[Edited on January 26, 2010 at 8:23 AM. Reason : .]

1/26/2010 8:23:37 AM

^^ from what I can tell you have to figure out density using temp, pressure, molar mass, and R

1/26/2010 8:24:47 AM

yes, given the information you have, that is what I would do.

1/26/2010 8:25:34 AM

but how do I determine the molar mass of NOx? I would think they would have to tell you how many Oxygen atoms there were (NO, NO2, NO3...)

1/26/2010 8:28:38 AM

oh, didn't read that part.... that's a little more difficult then... either assume one type.... if it's in an aqueous solution and you have the pH you can determine how much of each type is present...
but that's probably well beyond what this is.... time to e-mail someone

1/26/2010 8:36:14 AM

Ahh, ET 320, what a wonderful class.

1/26/2010 3:00:31 PM

it's a gas, just do it for NO and NO2 as those are the only apparent gasses, if NOx is part of a constituent molecule you have to drill it down to portion of molecular weight.

if it's a liquid then it's only NO or a acid of some sort

Molecular formula NO
Molar mass 30.006 g/mol
Appearance colourless gas
paramagnetic
Density 1.269 g/cm3 (liquid)
1.3402 g/l (gas)
Melting point

-163.6 °C, 110 K, -262 °F
Boiling point

-150.8 °C, 122 K, -239 °F
Solubility in water 7.4 ml/100 ml (STP)


Molecular formula NO2
Molar mass 46.0055(5) g/mol
Appearance brown gas
Density 1449 kg/m3 (liquid, 20 °C)
3.4 kg/m3 (gas, 22 °C)
Melting point

-11.2 °C, 262 K, 12 °F
Boiling point

21.1 °C, 294 K, 70 °F
Solubility in water reacts



760 mmHg = 1 atmosphere

[Edited on January 26, 2010 at 3:31 PM. Reason : ,]

1/26/2010 3:17:49 PM

did you read aph319's post tenaciousC?

its the best advice offered thus far

[Edited on January 26, 2010 at 3:20 PM. Reason : also, i'm assuming 289K is a typo?]

1/26/2010 3:19:07 PM