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Spring 2019 Due Jan 29th
PNGE 332
HOMEWORK #2
(Submit the typed HW in single pdf file through ecampus)
1. Pure Heptane is contained in a laboratory cell in which the volume can be varied. The
cell is maintained at a temperature of 400°F. The volume is changed until a few drops of
liquid Heptane are present. What is the pressure in the cell? The volume is reduced until
the cell is essentially full of liquid Heptane with only a few bubbles of Heptane gas
remaining. What is the pressure? Explain.
2. The densities of methane liquid and gas in equilibrium along the vapor-pressure line are
given below. Estimate the density of methane at its critical point of -116.7°F
Temperature °F
-253
-235
-217
-199
-181
-163
Density of saturated methane
Liquid
Gas
lb/ft3
lb/ft3
26.17
0.1443
25.25
0.2747
24.28
0.4766
23.18
0.7744
21.89
1.202
20.48
1.810
3. Estimate the critical pressure of a mixture of methane and n-butane if the critical
temperature of the mixture is known to be 200°F. Compare your answer with the critical
pressures of pure methane and pure n-butane (Use Appendix A).
4. Determine the compositions and quantities of gas and liquid when 2 lb mole of a mixture
of 35 mole percent methane and 65 mole percent ethane is brought to equilibrium at 400
psia and -40°F.
5. Determine the compositions and quantities of gas and liquid when 2 lb mole of a mixture
of 65 mole percent methane and 35 mole percent ethane is brought to equilibrium at 400
psia and -40°F. Compare your answer with the answer to problem 4. What was the effect
of changing the composition of the mixture?
6. Determine the compositions and quantities of gas and liquid when 10 lb moles of a
mixture of 55 mole percent methane, 30 mole percent propane and 15 mole percent npentane is brought to equilibrium at 160°F and 1500 psia.
7. A liquid of 80 mole percent propane and 20 mole percent n-pentane is to be diluted with
methane. Wi11 all mixtures of the liquid and methane be single phase at 160°F and 1500
psia? Explain the reason for your answer.
8. A liquid of 20 mole percent propane and 80 mole percent n-pentane is to be diluted with
methane. Wi11 all mixtures of the liquid and methane be single phase at 160°F and 1500
psia? Explain the reason for your answer.
PNGE 332
1. Determine
HOMEWORK #4
due Feb 19th 6:00 p.m
the formation volume factor of the following gas mixture at 5000 psig and
194 oF?
2. Determine the value of the coefficient of isothermal compressibility of the gas at 3335
psia and 170 oF
3. Calculate the viscosity of the gas at one atmosphere and 194 oF
4. Calculate the viscosity of the gas at 3810 psia and 194 oF and

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