Chapter 6, Problem 6.8P

The molar specific heat at constant volume of an ideal gas is equal to 2.5times the universal gas constant (8.314J/mol-K). When the temperature increases by 150K. Find the change in molar specific enthalpy.

a cylinder and piston arrangement contains 2 kg of R-134a at 150 kPa, 60 C. The piston is now moved slowly, compressing the refrigerant until it exists as saturated vapor. During this process, the necessary heat transfer takes place (do you agree that heat transfer ocurs, and if so explain) such that the temperature of the refrigerant remains constant. (a) Show the process on P-v, T-v, and T-s diagrams. Explain your diagrams. (b) Determine the final pressure and specific volume of the R-134a (c) Calculate the work done and the heat transfer for the process.

Parvinbhai

1) A certain quantity of air is initially at 200 kPa (absolute) and 35°C. If the final state after a thermodynamic process is 120 kPa and 10°C, find the polytropic index of the process and describe what type of process this index represents.

Water is heated in a closed container with rigid walls that is a perfect cube (1 m x 1 m x 1 m). The initial volume of the water (liquid + vapor) is 1 m'. The initial temperature of the water is 100 °C and it has a quality of 0.3. It is heated until it reaches a final pressure of 700 kPa. a. Sketch the process on the P V diagram. b. What is the work done by the water during this heating process in kJ? c. What is the final temperature of the water? d. What is the heat required in order for this process to occur in kJ? P V

A quantity of air is heated from 30 °C to 110 °C.  Assume air is an ideal gas, in which is has constant specific heats.  What is the change in specific internal energy and specific enthalpy that the air goes through in this process?

Air at 20℃, 100 kPa is compressed in a piston/cylinder without any heat transfer to apressure of 200 kPa. How do the properties (T, v, u and s) change? (increase, aboutthe same or decrease).

Calculate the compressor work in kJ required to compress 1 kg of an ideal gas from an initial volume and pressure of 0.65m3 and 101.3kpa to a final pressure of 517kpa & volume of 0.1943m3.  Ans. 133.549 kJ

Please state the assumptions and tables.