Spr05Test2 - 1 PGE 312 - SPRING 2005 Physical and Chemical...

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1 PGE 312 - SPRING 2005 Physical and Chemical Behavior of Petroleum Fluids I Test #2, 50 Minutes Closed Book Note: It will be in your best interest to attempt all the questions. Please budget your time accordingly. Problem 1 ( 20 points ) A binary mixture of 84 moles of ethane and 36 moles of n-heptane is confined in a vessel at P = 100 psia and T = 260 F. The equilibrium ratios (k-values) for ethane and n- ˚ heptane at the given pressure and temperature are as follows: Component k-value Ethane 11.1231 n-Heptane 0.3368 Determine a. The moles of gas in the vessel if any.
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2 b. The composition of the gas expressed in mole fractions. Please circle the answers you want me to grade.
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3 Problem 2 (80 points) Figure 1 shows the results of a flash calculation for a ternary system at P = 1000 psia and T = 160 F. There are 80 lb moles of total mixture. The volume of the liquid is 50.46 cu ˚ ft. 1 2 3 Gas composition in mole fractions 0.7898 0.1208 0.0894 m p np y y y y y y y     = = =       Amount of gas
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Spr05Test2 - 1 PGE 312 - SPRING 2005 Physical and Chemical...

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