Q3/ A 5.0-m tank is charged with 75.0 kg of propane gas at 25°C. Use the SRK equation of state to estimate the pressure in the tank; then calculate the percentage error that would result from the use of the ideal gas equation of state for the calculation. C,Hg: Te = 369.9 K Pc = 42.0 atm(4.26 x 10° Pa) @= 0.152 (RT.)? a = 0.42747 Pc RTc = 0.08664 Pc b m = 0.48508 + 1.55171w – 0.1561o- T; = T/Te %3D a = |1 + m T. RT P = aa V(Û + b)

A piston/cylinder apparatus initially contains 0.4 kg of saturated water vapor at a pressure of 200 kPa. The water vapor is now heated until the (extensive) volume of the H,0 is 0.5 m³ (state 2). (a) Fill in the following table. H,0 State Temp. T(C) P (kPa) Specific volume Volume Specific internal energy u (kJ/kg) 2529.1 Pressure P, = 200 kPa V (m?) Sat. vapor v (m³/kg) 1 200 0.5 state 1. (b) Determine the total work done by the H20 during the process, 1→2. (c) Determine the total heat transfer to the H,0 during the process, 1→2. (d) Draw the process on a P-v diagram. Label both states. (e) EXTRA CREDIT: Determine the change in enthalpy of the H20 from 1>2 and explain why this answer makes sense.

A PV diagram below, Figure 1, shows two possible states of a system containing three moles of a monatomic ideal gas. (P,= P2 = 450 Pa, V, = 2m', V,= 8m²) c. Draw the process which depicts an isothermal expansion from state 1 to the volume V, followed by an isochoric increase in temperature to state 2 and label this process (B). d. Find the change in internal energy of the gas for the two-step process (B) Figure 1 (N/m²) 500 ! 400+ 300+ 200+ 100 - + + + + 4 6. 8 10 V (m³) 2 Copyright © 2005 Pearson Prentice Hall, Inc.

Consider a tank containing gaseous Helium. It is perfectly insulated and rigid. There is a paddle wheel to stir the Helium, which is rated at 0.12. The paddle wheel is operated for 42 min. Determine the final equilibrium pressure of the He gas, in units of psia. The initial gas conditions are given in the table below: mass (Ibm) T (°F) p (psia) |1.3 68.1 43.5