# PNGE332 Compositions and Quantities of Gas Assignment

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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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Super_Teach12
School: New York University

Hi, here is you two assignments :)

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?

𝑇𝑝𝑟 =
=

𝑇
𝑇𝑝𝑐

564
350.2

= 𝟏. 𝟖𝟕

𝑃𝑝𝑟 =
=

𝑃
𝑃𝑝𝑐

5014.7
666.9

= 𝟕. 𝟓𝟐
𝒛 = 𝟏. 𝟎𝟑
Now. let us find 𝐵𝑔:
(0
(0.00502)((1.03)(194 + 460))
𝐵𝑔 =
5000 + 14.7
𝒓𝒆𝒔 𝒃𝒃𝒍
= 𝟎. 𝟎𝟎𝟎𝟔𝟕𝟒
𝒔𝒄𝒇

2. Determine the value of the coefficient of isothermal compressibility of the gas at 3335
psia and 170 oF
We will apply CprTpr correlation to find Cg:
𝑇𝑝𝑟 =
𝑃𝑝𝑟 =

630
= 1.80
350.2

3349.7
= 5.02
666.7
𝑧 = 0.30

Now, find the coefficient of isothermal compressibility of the gas:
𝐶𝑝𝑟 =
𝐶𝑔 =

0.30
= 0.167
1.80

𝐶𝑝𝑟
0.167
=
=
𝑃𝑝𝑐
666.9

= 𝟐𝟓𝟎 ∗ 𝟏𝟎−𝟔 𝒑𝒔𝒊−𝟏

3. Calculate the viscosity of the gas at one atmosphere and 194 oF

𝑉𝑖𝑠𝑐𝑜𝑠𝑖𝑡𝑦 𝑎𝑡 1 𝑎𝑡𝑚 𝑎𝑛𝑑 194℉:
𝑢𝑔 =

0.052
4.057

= 𝟎. 𝟎𝟏𝟐𝟖𝒄𝒑

4. Calculate the viscosity of the gas at 3810 psia and 194 oF and

𝑢𝑔1 = 0.0128𝑐𝑝
𝑇𝑝𝑟 = 1.87
𝑃𝑝𝑟 =

3824.7
= 5.74
666.9

𝑢𝑔
= 2.4 (𝑓𝑟𝑜𝑚 𝑓𝑖𝑔. 6 − 9)
𝑢𝑔1

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 c...

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