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cpinder
 one year ago
Estimate the temperature at which 40 kg of ethane stored in a 0.15 m3 vessel exerts a pressure of 20000 kPa.
cpinder
 one year ago
Estimate the temperature at which 40 kg of ethane stored in a 0.15 m3 vessel exerts a pressure of 20000 kPa.

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cpinder
 one year ago
Best ResponseYou've already chosen the best response.0So far, I've got calculated the volume like this. Vt=0.15m3=150000cm3 V=V/MW=150000cm3/(40kg*30mol/kg) = 112500 cm3/mol And I've calculated Pr like so. Pr=P/Pc= (20000 kPa*.01 bar/kPa) / 48.72 bar = 4.105 I'm lost from here.

aaronq
 one year ago
Best ResponseYou've already chosen the best response.0Why not just use the ideal gas law?

cpinder
 one year ago
Best ResponseYou've already chosen the best response.0@aaronq we can't use the ideal gas law because this is a non ideal gas. It has a compressibility factor of z, which we don't know. I'm looking at the solution manual right now and this is what it says. PV=ZRT=ZRTrTc Tr=alpha/Z where alpha=PVR/Tc alpha=29.548mol/kg (Tried to get this but I couldn't) whence Tr=0.889/Z at Pr=P/Pc (I've calculated Pr already) This equation giving Tr as a function of Z and eq (3.57) in conjunction with tables E3 and E4 are two relations in the same variables which must be satisfied at the given reduced pressure. The intersection of these two relations can be found by one means or another to occur at about: Tr=1.283 and Z=0.693 From there, T=TrTc=391.7K or 118.5C

aaronq
 one year ago
Best ResponseYou've already chosen the best response.0Oh okay, you're into real gases now

aaronq
 one year ago
Best ResponseYou've already chosen the best response.0I can help you with this later, cuz i gotta go. Hopefully someone else capable comes before hand if you need this asap. I'll look back at this question later today

cpinder
 one year ago
Best ResponseYou've already chosen the best response.0@aaronq just realized I put this in chemistry and not in thermodynamics.
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