Van der Waals Questions/Need help
Posted: Thu Jun 08, 2017 4:20 pm
Hello!
I am using the van der waals calculator to check my calculations but I seem to be getting very different numbers and im not sure why.
I am using this equation (P + a(n/v)^2)(v-nb) = nRT
My units are pressure in atm, volume in Liters and temp in kelvin. Im using R as atm L mol-1 k-1 . I am trying to isolate to solve for moles in a given container.
My Pressure is 3600 psi ~ 244.9655 atm
My internal volume is 41.9 L
My temperature is 294.2611111 K
The gas i am correcting for is oxygen.. My a is 1.362652 atm L^2 mol^-2 and my b is 0.03186 L/mol.
Calculating this out and solving for n i get 462.324 moles however the webqc calculator gives me 321.458....
I'm not sure if I am running into a conversion error or a simple mathematical error but if anyone could help that would be awesome!
I am using the van der waals calculator to check my calculations but I seem to be getting very different numbers and im not sure why.
I am using this equation (P + a(n/v)^2)(v-nb) = nRT
My units are pressure in atm, volume in Liters and temp in kelvin. Im using R as atm L mol-1 k-1 . I am trying to isolate to solve for moles in a given container.
My Pressure is 3600 psi ~ 244.9655 atm
My internal volume is 41.9 L
My temperature is 294.2611111 K
The gas i am correcting for is oxygen.. My a is 1.362652 atm L^2 mol^-2 and my b is 0.03186 L/mol.
Calculating this out and solving for n i get 462.324 moles however the webqc calculator gives me 321.458....
I'm not sure if I am running into a conversion error or a simple mathematical error but if anyone could help that would be awesome!