Unimolecular Diffusion Example

[@SovalleR]

Thank you so much. I just discovered your channel and I'm glad I did!. Greetings from ChemE student in Colombia. =)

[@esodpsmain9925]

It'd be useful to include the atmospheric pressure at boulder for those of us who don't live there :)

[@eileenmendoza875]

So is 624mmHg the atmospheric pressure in boulder?

[@anitayuliyanti4766]

Hi, I wonder where this value is come from?

[@mido9545]

@@anitayuliyanti4766 I think it is total pressure of ether in beaker and in air

[@jozelvalenzuela8337]

Why did he not provide the full information to us, on ambient temp P is 760mmHg but how did is become 624mmHg?

[@prabuddhagope5216]

I'm confused about the concentration term, 'c' used to calculate the flux. Isn't it supposed to be the total concentration of material and not the concentration of one particular component of the mixture? And if so, at 4:00, wouldn't we take the pressure used to calculate the concentration as the atmospheric pressure, rather than the vapor pressure of ethyl ether?

[@galvalan]

he did indeed used atmospheric pressure, not vapor pressure of ethyl ether. It's just that he used the atmospheric pressure at his location. Check out his mole fraction of ethyl ether calculation in 4:55 and convert the pressures to Pa. The denominator should be consistent to pressure in 'c'.

[@franziskapiefke9597]

Hi! Why did we use zo= 12.192 and zt= 30.48? I understand that that is the stagnant layer. However, why don't we use the height of the liquid? I thought it would be: zo= 18.29 and zt=0

[@Vipez]

Why would stagnant layer thickness increase?

[@ChemicalEngineeringGuy]

Stagnant layer = air enlosed in the beaker... As the ether evaporates, the "air" or actually the "space" of the beaker increases, therefore, the layer increases... In common words, it is getting emptied, therefore, more air inside