c* = [2RT/M]½ |
P(v)/P(c*) = (v/c*)2 eM(c*2-v2)/2RT |
VTCV/R = constant for rev. adiab. exp. |
Condensation is isothermal and isobaric and the reverse of evaporation. So qP = DcondH = - DvapHq = - 82.9 J/mol.w = - PextDVm where for normal condensation, Pext=1 atm.
r = MW/Vm or Vm = MW/r
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at the B'P term. It's a simple matter to determine B' by experiment on near-ideal gases, but B' is a function of temperature. We can estimate the temperature dependence of B' easily using the Joule-Thompson equation
Find the simple expression relating (dB'/dT)P to µ, CP, and T.
V = (RT/P)(1 + B'P) = RT[(1/P) + B'] |
Molecule | CH4(g) | O2(g) | CO2(g) | H2O(g) |
DfHq, kJ/mol | - 74.81 | 0.00 | - 393.51 | - 241.82 |
CP, J/mol K | NA | NA | 37.1 | 33.6 |
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