A gas enters the furnace with the following conditions: P, = 27 psia; V1 = 11.7 cu. feet per pound; U1= 102.6 Btu per pound; V, = 162 feet per second. The substance leaves the system with the following conditions: P2 = 34 psia; V2 = 10.3 cu. feet per pound; U2= 149.0 Btu per pound; V2 = 605 feet per second. Change in elevation are negligible and 10 Btu per pound heat is added to the fluid as it passes through the system. Calculate the work done on or done by the system.

Thermodynamics T-11 All air is removed (vacuumed) from a 2 liter closed container that contains 200 ml of Liquid A and 600 ml of Liquid B at a temperature of 20C. At this temperature Liquid A has a density of 0.825 g/ml and vapor pressure of 25 kPa. Liquid B has a density of 0.750 g/ml and vapor pressure of 15 kPa. What is the mol fraction of vapor from Liquid A in the head space above the liquid surface? A) .25 B) .38 C) .63 D) .75

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A piston-cylinder assembly contains a mystery substance that undergoes a series of processes. Process 1-->2: Constant pressure process at 5bar from v1=.07m3/kg to v2=.12m3/kg Process 2->3: Constant volume process to saturated vapor Process 3->4: Constant temperature process to quality of 50% Process 4->5: Constant volume process to 5bar Sketch the processes on Pt, Pv, and Tv, plots. Lable the axes including property values; use closed dots to show the states, use solid lines to connect the states, add number and arrows to make clear the states numbers and process directions. Could this be considered a thermodynamic cycle? Why or why not?