An ideal gas, occupying a volume of 0.02 m3 , has a temperature of 25 0C and is at 1.2 bar. The gas is compressed reversibly and adiabatically to a final pressure of 8 bar. Assuming the gas has an adiabatic index of γ = 1.4, calculate (a) the final temperature, (b) the final volume, (c) the work performed during the compression and (d) the heat transferred.

0.03 m3 of nitrogen having molecular weight 28 contained in a cylinder behind a piston is initially at 1.05 bar and 15°C. The gas is compressed isothermally and reversibly until the pressure is 4.2 bar. Find the change in entropy in kJ/K. Note: Your answer must be at least 3 decimal places.

For small temperature differences, the exact and approximate relations for entropy changes of ideal gases give almost identical results.

. One kmol of an ideal gas, initially at 303.15 K (30°C) and 1 bar, undergoes the following mechanically reversible changes. It is compressed isothermally to a point such that when it is heated at constant volume to 393.15 K (120°C) its final pressure is 12 bar. Calculate Q, W, AU, and AH for the process. Take Cp = (7/2)R and Cy = (5/2)R. %3D %3D

Superheated steam, 0.270 kg,0.270 kg, at a temperature of 250 ∘C250 ∘C and an unknown pressure is compressed reversibly in a closed system until a saturated vapor at 250 ∘C250 ∘C is reached. During this isothermal compression process, a heat loss of 105 kJ105 kJ is noted. Assume the temperature of the surroundings is 27 ∘C. What was the initial pressure (kPa)? Find the amount of work done in this process.

for a real substance how P (pressure) changes with changes in V (volume) and T (temperature) in terms of an equation of state involving  B (isobaric volumetric thermal expansion coefficient) and  K (isothermal compressibility). Calculate the work done (W) if the pressure on 1g of water in a hydraulic press is increased reversibly from 1 bar to 10,000 bar isothermally. Assume that the temperature is 4°C and the volume is 1 cm³. For water, B = 2 × 10^-4 K^-1 and K = 5 × 10^-5 bar^-1.

Water at the initial pressure and temperature of P1 = 40 bar and T1 = 553.15K, respectively, is cooled at constant volume, while heat is transferred to the surroundings at T0= 288.15K. At the end of the cooling process, the pressure is P2 = 9 bar. Questions: (a) Calculate the entropy change of the water during the process. (b) Calculate the entropy produced during the process.

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Estimate the Joule-Thomson coefficient of refrigerant-134a at 240 kPa and 20°C. Assume the second state will be selected for a pressure of 200 kPa. Use data from the tables. The Joule-Thomson coefficient of refrigerant-134a is K/kPa.

A quantity of an ideal gas, Cp=(7/2) R at 20°C and 1 bar having a volume of 70 m3 is heated at constant pressure to 25°C by the transfer of heat from a heat reservoir at 40°C. Calculate the heat transfer to the gas, the entropy change of the heat reservoir the entropy change of the gas, and the AStotal. What is the irreversible * ?feature of the process