Question

Calculate the fugacity and fugacity coefficient of n-butane in the liquid state at 350 K and 60 bar

Answer #1

determine the fugacity and fugacity coefficient of steam at 623
k
and
1000 kPa

Using the van der Waals EOS for n-butane,
a.Calculate the a and b parameters
.
b.Calculate the liquid density of n-butane at 100°C and
1MPa.
c.Calculate the fugacity of liquid n-butane at these
conditions.
d.Calculate the vapor density and fugacity of n-butane at 100C
and 1MPa.
e.indicate which is the stable phase at these conditions and
guess a new pressure that would
be closer to the vapor pressure

n-butane is to be liquefied to make liquid petroleum
gas (LPG). The butane is available at 25◦C and 1 bar,
it will be compressed to 15 bar in a compressor that
has an isentropic efficiency of 85%, cooled to 0◦C
in a heat exchanger, and then expanded adiabatically
to 1 bar, with the vapor recycled to the compressor.
Determine the work required per kg of LPG produced.

The fugacity coefficient of a certain gas at 290K and 3.1MPA is
.70. Calculate the difference of its molar Gibbs energy from that
of a perfect gas in the same state.

CALCULATE THE FUGACITY COEFFICIENT OF TOLUENE AT 50 °C
& 25 KPA USING THE VIRIAL EQUATION OF STATE TRUNCATED AFTER THE
SECOND TERM. SUCH AN EQUATION OF STATE IS GIVEN BY THE FOLLOWING
EXPRESSION: Z=1+ (BP/RT), WHERE THE SECOND VIRIAL COEFFICIENT (B)
FOR TOLUENE IS -1,860 CM3/MOL.

Determine the molar volume of n-butane at 425 K and 38 bar by
the generalized compressibility-factor correlation.

n-butane vapor and liquid are in equilibrium (boiling) at 18.66
bars. Use the Peng-Robinson equation of state to determine the
saturated liquid and saturated vapor molar volumes. Also determine
the saturated liquid molar volume using the Rachett equation. In
addition, use the Pitzer correlation for the Virial EOS to estimate
the saturated vapor molar volume.

If the reference state of n-hexane is set as liquid at 25 °C and
1 bar, what is the enthalpy of the n-hexane at the exit condition
in problem 3? What is the enthalpy of n-hexane as a vapor at 85
°C?
For n-hexane as a liquid: Cp(J/mol K) =–75.225 + 1.176 T–1.344 x
10-3 T^2

For a mixture of n-butane (1) + n-pentane(2) at 298.15 K, what
would be the predicted bubble-point pressure using Raoult’s Law if
your mixture was 20% n-butane by mole? Would you expect Raoult’s
law to be a good model for this system? Why or why not

Calculate the volume for n-butane at 313.28℃ and 75.92 bar
according to:
1. The ideal gas equation
2. The theorem of corresponding states
3. Generalised correlation for the Compressibility factor
4. Generalised correlation for the Second virial coefﬁcient.

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