Fluids Final Practice

# Fluids Final Practice - 4 1 2 T1 5 Exam 1 Spring 2007 1 3 4...

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4 1 2 5 3 P V T = T 1 C T c T 1 1 4 2, 3, 5 P T Exam 1 Spring 2007 2 (20 points) Fifty grams (50g) of a pure hydrocarbon is confined in a piston-cylinder vessel of volume 1000 cm 3 , maintained at a constant temperature of 200 F. The saturated liquid and saturated vapor ˚ densities of the hydrocarbon at 200 F are 0.45 g/cm ˚ 3 and 0.05 g/cm 3 , respectively. The vapor pressure data for the pure hydrocarbon are given in Table 1. Table 1 Vapor Pressure Data for the Pure Hydrocarbon of Problem 1 Temperature Vapor Pressure ( F) ˚ (psia) 50.0 31.9 100.0 72.5 150.0 143.1 200.0 255.4 250.0 422.2 274.5 527.9 a. Calculate the mass of vapor in the vessel in grams.

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b. Determine the pressure in the vessel in psia. Please explain the reasoning behind your answer in part (b) to get full credit. There will be no credit for guessing the correct answer without an appropriate explanation.
c. If the pure hydrocarbon is expanded to a pressure of 100 psia at the constant temperature of 200 F, calculate the mass of liquid in the vessel in grams. ˚

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d. Using a dot ( . ), display the state of the hydrocarbon in part c on a P-V diagram at the fixed temperature of 200 F. Mark on your P-V diagram all the known numerical values ˚ of pressure in psia and all the known numerical values of volume in cm 3 . Problem 2 (25 points) Figure 1 shows 5 different states of a pure hydrocarbon component on a density diagram. Figure 1. Five states of a pure component on a density diagram.
a. Characterize each of the 5 states of the pure component. For example, in State 2, the pure component exists as a bubble point liquid. State 1. Liquid above its bubble point. Undersaturated liquid. Super-compressed liquid. State 2. Bubble point liquid. State 3. Dew point gas. State 4. Gas below its dew point. Undersaturated gas. State 5. Component exists partly as gas and partly as liquid. Two-phase system.

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## This note was uploaded on 03/08/2011 for the course PGE 312 taught by Professor Peters during the Spring '08 term at University of Texas at Austin.

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Fluids Final Practice - 4 1 2 T1 5 Exam 1 Spring 2007 1 3 4...

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