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Spring2010FinalExam - PGE 312 SPRING 2010 Physical and...

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PGE 312 – SPRING 2010 Physical and Chemical Behavior of Petroleum Fluids I Final Exam, 3 Hours Closed Book Note: It will be in your best interest to attempt all the questions (1 through 6). Please budget your time accordingly. Problem 1 (15 points) Determine the density of the following hydrocarbon liquid at a temperature of 180 F and the bubble point pressure of 4000 psia. The liquid specific gravities of the components at 60 F and 14.7 psia are given in Table 1 along with other pertinent information. Table 1 Component Liquid Composition (mole fraction) Molecular Weight (lbmass/lb mole) Component Specific Gravity n-Pentane 0.10 72 0.6311 n-Hexane 0.25 86 0.6638 Heptane + 0.65 218 0.8515 1.00 1
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Problem 2 (20 points) A hydrocarbon mixture consisting of methane, propane and n-pentane is maintained at a fixed temperature of 100 F. The composition of the total mixture and the equilibrium ratios (K-values) at two pressures (1500 psia and 500 psia) are given in Table 2. Table 2 Component Total Composition (mole %) Molecular Weight (lbm/lb mole) P = 1500 psia T = 100 F K-Values P = 500 psia T = 100 F K-Values Methane 25 16 2.700 6.600 Propane 40 44 0.400 0.490 n-Pentane 35 72 0.088 0.070
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