Chemical Forums

Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Fred on January 04, 2011, 05:17:27 PM

Title: need help with convertion
Post by: Fred on January 04, 2011, 05:17:27 PM: How to convert 57 liter Oxygen per hour to ppm?

Txs
Title: Re: need help with convertion
Post by: Natalia on January 04, 2011, 05:42:04 PM: I don't know what liters per hour stands for, but by intuition I would say you could convert Litres into number of parts (molecules) by the gas equation and the hour to minutes... I'm not sure though, so better wait for someone else to answer.

By the way, could you explain me where do we use the notation "Liters per hour"? I would really like to know.
Title: Re: need help with convertion
Post by: Borek on January 04, 2011, 05:57:41 PM: You can't convert liters per hour to ppm. One is speed, other is concentration, you can't convert one to other just like you can't convert mph to miles.
Title: Re: need help with convertion
Post by: chronictonic on January 05, 2011, 01:39:31 AM: Quote from: Borek on January 04, 2011, 05:57:41 PM
You can't convert liters per hour to ppm. One is speed, other is concentration, you can't convert one to other just like you can't convert mph to miles.

worse yet 'liters' isn't even a concentration, its an volume or amount.
Title: Re: need help with convertion
Post by: Borek on January 05, 2011, 03:37:54 AM: Quote from: chronictonic on January 05, 2011, 01:39:31 AM
Quote from: Borek on January 04, 2011, 05:57:41 PM
You can't convert liters per hour to ppm. One is speed, other is concentration, you can't convert one to other just like you can't convert mph to miles.

worse yet 'liters' isn't even a concentration, its an volume or amount.

No idea what you refer to, I guess you just didn't understand a word of my post.
Title: Re: need help with convertion
Post by: Fred on January 05, 2011, 09:06:41 AM: Quote from: Fred on January 04, 2011, 05:17:27 PM
How to convert 57 liter Oxygen per hour to ppm?

Txs

If oxygen is pressured into a liquid at ~ 65*F, and the only factor known is 57 liter ( 1liter X 1,000 = ml) per hour, how do we calculate the ppm O2 per hour ?
Title: Re: need help with convertion
Post by: Borek on January 05, 2011, 10:41:07 AM: We don't. Question still doesn't make sense. ppm of what in what?
Title: Re: need help with convertion
Post by: Twigg on January 05, 2011, 03:02:35 PM: It still doesn't make a lot of sense, but I think I know where the question is going. Is this what you mean?

If 57 liters of oxygen is dissolved per hour into a solvent at constant pressure at 65 degrees Farenheit, find the change of concentration of O2 in ppm per hour. (It can't be answered without volume of the solvent.)