Chapter 6, Problem 6.4E

3. A piston-cylinder assembly initially contains 3 kg of water at 75 kPa and pressure at 50 °C. Then the water is heated at constant pressure and the entropy of the water at the end of the process becomes 7.94 kJ / kgK. The entropy change during the process of water is: a. 24,81 kJ/K b. 21,71 kJ/K c. 14,86 kJ/K d. 16,2 kJ/K e. 7,23 kJ/K

2. The gain in entropy during an isothermal process of 5 lb of air at 60°F is 0.462 Btu/*R. What is the work in Btu?

A frictionless piston-cylinder device contains a saturated liquid-vapor mixture of water at 400K. During a constant pressure, process, 960 kJ of heat is transferred to the surrounding air at 300K.  As a result, part of the water vapor contained in the cylinder condenses. Determine the entropy change of the surrounding air in kJ/K.

a) A piston-cylinder device contains a working fluid which undergoes an irreversible and non-adiabatic process. Will the following entropy of the fluid increase or decrease? Entropy changes of a system, AS ii) Entropy generation, Sgen Briefly explain your answer. UTM OUTM

Define a new property called entropy to quantify the second-law effects.

An ideal gas with V = 5x105 cm³, P = 150x103 Pa and T = 293K is contained in a piston-cylinder. The gas is isothermally compressed with a constant external pressure of 400x103 Pa. Assuming the surroundings is at 293K and the gas Cp = 25R: %3D %3D %3D a. Determine the heat transfer during the process b. What is the entropy change of the system, surroundings, and overall? C. Is the process reversible, irreversible, or impossible?

A frictionless piston-cylinder device contains a saturated liquid-vapor mixture of water at 400K. During a constant pressure, process, 960 kJ of heat is transferred to the surrounding air at 300K.  As a result, part of the water vapor contained in the cylinder condenses. Determine the entropy change of the water in kJ/K.

Steam at a temperature of 240 oC has a specific volume of 0.15436 m3 /kg. Determine pressure, specific internal energy, enthalpy and entropy.

Water (2 kg) is in a rigid tank where 22% of the water is in the liquid phase and the temperature is 50 deg C. The tank is heated until all the water is in the vapor phase at a temperature of 120 deg C. This process requires 389 kJ of heat. The wall of the tank is maintained at a constant temperature of 0,4 deg C. What is the entropy produced (kJ/K)? (Report answer to three decimal places)