Chapter 6, Problem 6.47P

Solve the following problem using the right Thermodynamics properties table.

A rigid, well-insulated tank contains air. A partition in the tank separates 12 ft^3 of air at 14.7 lbf/in2, 40◦F (left side of the tank) from 10 ft^3 of air at 50 lbf/in2, 200◦F(right side of the tank), as illustrated in the figure. The partition is removed and air from the two sides mix until a final equilibrium state is attained. The air can be modeled as an ideal gas, and kinetic and potential energy effects can be neglected. (Note: values for the left side of the tank are denoted with a subscript L, and values for the right side of the tank are denoted with a subscript R). a) Determine the final temperature (in F) b) Determine the final pressure (in lbf/in^2) c) Calculate the amount of entropy produced, in Btu/R d) Is this mixing process reversible or irreversible?

Problem 3.091 SI Carbon dioxide (CO2) is compressed in a piston–cylinder assembly from p1 = 0.7 bar, T1 = 280 K to p2 = 8 bar. The initial volume is 0.2 m3. The process is described by pV1.25 = constant.Assuming ideal gas behavior and neglecting kinetic and potential energy effects, determine the work and heat transfer for the process, each in kJ, using constant specific heats evaluated at 300 K, and data from Table A-23.

A mole of ideal gas at state 1(P=1.00 bar, T=25.0° C, V=0.02479 m³) underwent two thermodynamic paths: (Path A) heating at constant volume to 1490.75K followed by (Path B ) cooling at constant pressure to reach state 2(P=5.00 bar, T=25.0 ° , V=0. 00496 m³). Calculate for the change of in internal energy, change in enthalpy, heat and work for the whole thermodynamic process. The specific heat of an ideal gas at constant pressure (Cp) is 29.099 J/mol-K and it's specific heat at constant volume (Cv) is 20.785 J/mol-k

2

Helium contained in a closed, rigid tank, initially at 60°C, 2 bar, and a volume of 1.9 m³, is heated to a final pressure of 6 bar. Assume the ideal gas model for the helium. Kinetic and potential energy effects can be ignored. Determine the mass of the helium, in kg, and the heat transfer, in kJ. mass of helium, m = Heat transfer, Q₁2 = 578.102 x kg kJ

Chapter 6 6.

A rigid tank whose volume is 4 mở, initially containing air at 1 bar, 295 K, is connected by a valve to a large vessel holding air at 6 bar, 295 K. The valve is opened only as long as required to fill the tank with air to a pressure of 6 bar and a temperature of 350 K. Assuming the ideal gas model for the air, determine the heat transfer between the tank contents and the surroundings, in kJ. Qev i 339.86 kJ

An ideal gas is confined to one side of a rigid, insulated container divided by a partition. The other side is initially evacuated. The following data are known for the initial state of gas: P1 = 5 bar, T1 = 500 K, and V1 =0.2 m3. When the partition is removed, the gas expands to fill the entire container, which has a total volume of 0.5 m3. Assuming that there is no change in the internal energy of the gas, determine the (a) pressure, in bar and the (b) product of mass, specific gas constant and T in the final state (in kPa-?3)