Homework Help: Chemistry

Posted by Ling on Friday, January 11, 2013 at 10:48pm.

(a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of CO2 at 10 atm is 6.97 x 10-4 moles/cm3 at 35 C. The diffusivity of CO2 in the polymer is known to be 2.29 x 10-8 cm2/s at this temperature. How long will it take for 0.001 moles of CO2 to leak from the container at steady-state? Assume that the amount of carbon dioxide in the surroundings is insignificant. Express your answer in hours.

(b) If the diffusivity is observed to double when the temperature is increased by 10 degrees C, what is the activation energy for diffusion? Express your answer in units of eV.

Chemistry - c, Friday, January 11, 2013 at 10:51pm
conversion for seconds to hours is 60*60 or multiply 3600.
Chemistry - go, Friday, January 11, 2013 at 11:25pm
could you please explain the formula
i tried everything
thanks for your time
Chemistry - po, Friday, January 11, 2013 at 11:30pm
18
Chemistry - helper, Friday, January 11, 2013 at 11:53pm
18
Chemistry - Anonymous, Friday, January 11, 2013 at 11:59pm
Thanx
Chemistry - c, Saturday, January 12, 2013 at 1:09am
So what is a) and what is b)?
Chemistry - ani, Saturday, January 12, 2013 at 8:10am
18 is not right
Chemistry - martin, Saturday, January 12, 2013 at 9:52am
someone please help regarding answer of a and b. 18 is not showing green check
Chemistry - Chemgam, Saturday, January 12, 2013 at 9:59am
Same here. Received a red X on the answer.
Chemistry - which, Saturday, January 12, 2013 at 12:29pm
formula for formula in #8
Chemistry - Anonymous, Saturday, January 12, 2013 at 1:39pm
4.5
Chemistry - Anonymous, Saturday, January 12, 2013 at 1:42pm
WONG ANSWER
Chemistry - martin, Saturday, January 12, 2013 at 2:51pm
what would be answer of b. would it be 45
Chemistry - Ling, Saturday, January 12, 2013 at 4:39pm
B) is not 45 and A) is not 18
Chemistry - Anonymous, Saturday, January 12, 2013 at 11:34pm
Impossible for someone to explain
Chemistry - Anonymous, Sunday, January 13, 2013 at 12:16am
a) 1.74
Chemistry - qwerty, Sunday, January 13, 2013 at 12:21am
thanks
Chemistry - Ling, Sunday, January 13, 2013 at 1:39am
Thanks
Chemistry - c, Sunday, January 13, 2013 at 1:39am
Thanks for a) any thoughts on b)?
Chemistry - martin, Sunday, January 13, 2013 at 2:26am
somebody please tell the answer of b. I tried with all equation.
D=D0e^-Ea/RT
Created Eq.1 for 35+273K
and Eq.2 for 45+273k

i got Ea 1.55*10^4J/mol
even after conversion with j/mol to EV not getting green check
1KJ/mol=1.03*10^-2

if some body got green check please suggest me.
Chemistry - Anonymous, Sunday, January 13, 2013 at 6:08am
Suggestion: do the work yourself rather than cheating. If you're desparate for a green tick, draw one in a graphics program
Chemistry - Chemical Engineer, Sunday, January 13, 2013 at 7:53am
MIT the best university in the world. why are you cheating? whay are you not reading and understand the leacture?
Bad student >>>
Chemistry - qpt, Sunday, January 13, 2013 at 8:09am
how to convert j/mol to EV?
Chemistry - martin, Sunday, January 13, 2013 at 8:15am
1KJ/mol=1.03*10^-2EV
please somebody tell about b
Chemistry - Chemical Engineer, Sunday, January 13, 2013 at 8:22am
return to lecture and you get b
Chemistry - Chemical Engineer, Sunday, January 13, 2013 at 8:28am
this is Honor. Please stop cheating
this is not useful for you
Chemistry - Chemical Engineer, Sunday, January 13, 2013 at 8:28am
this is Honor. Please stop cheating
this is not useful for you
Chemistry - qwerty, Sunday, January 13, 2013 at 3:52pm
b=0.551
Chemistry - Ling, Sunday, January 13, 2013 at 11:19pm
Thank you

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