11. The work required to compress a gas reversibly according to pv1.30- cis 67, 790 J, if there is no flow. Determine AU and Q if the gas is (a) air, (b) methane. For methane, k = 1.321, R=518.45 1/kgm K, C = 1.6187, cp = 2.1377 kJ/kgm.K. Ans. (a) 50.91 KJ, -16.88 kJ; (b) 63.50 kJ, -4.29 kJ

One-quarter Ibmol of oxygen gas (O₂) undergoes a process from p₁ = 20 lbf/in², T₁ = 500°R to p2 = 150 lbf/in². For the process W = -500 Btu and Q = -177.5 Btu. Assume the oxygen behaves as an ideal gas. Determine T2, in °R, and the change in entropy, in Btu/°R.

Topic: Ideal gas process Instructions: Answer the following review questions and show complete solutions. *please write legibly. Thank you

One-quarter lbmol of oxygen gas (O2) undergoes a process from p1 = 20 lbf/in2, T1 = 500oR to p2 = 150 lbf/in2. For the process W = -500 Btu and Q = -140.0 Btu. Assume the oxygen behaves as an ideal gas. Determine T2, in oR, and the change in entropy, in Btu/oR.

Q6: n moles of CH4, considered as an ideal gas, are taken through the following thermodynamic cycle: A→B: isovolumetric transformation from pressure PA and volume VA to pressure PB=2 PA B→C: isobaric expansion from volume VA to volume VC=3 VA C→D: isovolumetric transformation down to pressure PD=PA D→A: isobaric compression  a. Sketch the (ABCD) cycle on a P-V diagram and determine all the unknown pressures, volumes and temperatures at points A, B, C and D in terms of n, R, PA and VA. b. Determine the net mechanical work done by the gas over the entire cycle. c. Determine the heat absorbed by the gas over each leg of the cycle.

3. Ideal air (mass =lkg) in a piston-cylinder assembly undergoes two reversible processes in series from state 1, where T;=290K and Pi= 1bar. The gas constant is 8.314 (kJ/kmol.K). Process 1-2: compression to P3=5 bar in a polytropic process with n=1.19 Process 2-3: expansion in an adiabatic process to P3=1bar Determine the temperature at state 2 and 3 in (K) The total work and heat transfer. Plot on TS diagram.

Using the appropriate tables, determine the specific entropy change in kJ/(kg K) between the states indicated. a)Water, P1 = 10 MPa, T1 = 400°C, P2 =10 MPa, T2 = 100°C b)R134a, h1 =111.44 kJ/kg, T1 =40°C, saturated steam P2 =5 bar. c) Ideal gas air, T1 =7°C, P1 = 2 bar, T2 =327°C, P2 = 1 bar.

An ideal gas,Cp=5/2 R and Cv=3/2 R, is changed from P1=1 bar and V1=12m^3 to P2=12 bar and V2=1m^3 by the following mechanically reversible process. a)Isothermal compression b)Adiabatic compression followed by cooling at constant pressure c)Adiabatic compression followed by cooling at constant volume. Calculate Q,W,U and H in each case and find the total Q,W,H and U . Answers should be in kJ. SOLVE STEP BY STEP PLEASE

Question #2 For the following processes, find the changes in h  as appropriate. The initial state pressure is p1 = 0.5 MPa. the final state is 2.   a.  constant volume :                   v1 = 0.3 m3/kg,            p2 = 0.3 MPa; b. constant entropy :                    s1 = 6.3 kJ/kg K,        p2 = 0.15 MPa; c. constant volume :                    h1 = 2500 kJ/kg,          p2 = 0.2 MPa; d. constant enthalpy :                 s1 = 6.4 kJ/kg K,        p2 = 0.2 MPa;

Q.4 For a liquid, at a temperature of 8 °C the vapor pressure is 2.7 kPa. Its enthalpy of vaporization is constant and equals 42700 kJ/kmol. At a vapor pressure of 13.5 kPa, the 0, temperature of the vapor (in °C) will be. Take gas constant R=8.314 kJ/kmol-K A 58.7 B 51.4 C 44.3 D 35.133