Chapter 6, Problem 6.39CU

A 300-lb iron casting, initially at 1500°F, is quenched in a tank filled with 2121 lb of oil, initially at 80°F. The iron casting and oil can be modeled as incompressible with specific heats 0.10 Btu/lb · °R, and 0.45 Btu/lb · °R, respectively. (a) For the iron casting and oil as the system,determine the final equilibrium temperature, in °F. Ignore heat transfer between the system and its surroundings. Tf = i °F (b) For the iron casting and oil as the system,determine the amount of entropy produced within the tank, in Btu/°R. Ignore heat transfer between the system and its surroundings. O = i Btu/°R

can water ever acts counter to entropy to perhaps stop a reaction from moving forward?

A divider separates 1 lb mass of carbon monoxide (CO) from a thermal reservoir at 150o F. the carbon monoxide, initially at 60o F  and 150 lbf/in2, expands isothermally to a final pressure of 10 lbf/in2 while receiving heat transfer through the divider from the reservoir. The carbon monoxide can be modeled as an ideal gas. (a) For the carbon monoxide as the system, evaluate the work and heat transfer, each in Btu and the amount of entropy produced, in Btu/oR. (b) Evaluate the entropy production, in Btu/oR, for an enlarged system that includesthe carbon monoxide and the divider, assuming the state of the divider remains unchanged. Compare with the entropy production of part (a) and comment on the difference.

9. A certain ideal gas whose R=278.6J/kg.Kande =1.015 kJ/kg. K expands isertropically from 1517 kPa, 288 Ć to 965 kPa. For 454 g/s of this gas determine, (a) W (b) V (e) AU and (g) AH.

An ideal gas is confined to one side of a rigid, insulated container divided by a partition. The other side is initially 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 evacuated. The following data are known for the initial state of gas: P1 = 5 bar, T1 %3D 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-m³).

A 300-lb iron casting. initially at 600°F, is quenched in a tank filled with 2121 lb of oil, initially at 80°F. The iron casting and oil can be modeled as incompressible with specific heats 0.10 Btu/lb - °R. and 0.45 Btu/lb - °R, respectively. (a) For the iron casting and oil as the system.determine the final equilibrium temperature, in °F. Ignore heat transfer between the system and its surroundings. °F (b) For the iron casting and oil as the system,determine the amount of entropy produced within the tank, in Btu/°R. Ignore heat transfer between the system and its surroundings. Btu/°R

Carbon dioxide (CO₂) fills a closed, rigid tank fitted with a paddle wheel, initially at 80°F, 30 lb-/in², and a volume of 1.8 ft³. The gas is stirred until its temperature is 500°F. During this process heat transfer from the gas to its surroundings occurs in an amount 2.6 Btu. Assume ideal gas behavior, but do not assume constant specific heats. Kinetic and potential energy effects can be ignored. Determine the mass of the carbon dioxide, in lb, and the work, in Btu.

p/atm 2.0 1.0 EXERCISE 3 (c) 3 1 thermal (b) Ⓡ One mole of an ideal gas undergoes a cyclic three-step process according to Figure 2: (a) 1->2: reversible and adiabatic expansion starting at T₁, and pressure = 2 atm. pl (b) 2->3: reversible isothermal compression up to p3 = 1 atm and (c) 3->1: heating under constant volume, at final temperature Ti, and pressure p1 = 2 atm. Calculate the entropy changes of the gas for the three steps and for the cycle. The heat capacity under constant volume is given: cx= 12.47 J mol-¹ K-¹. V Enter your results (with units) in the Table below AS₁1+2 AS2+3 AS3+1 AS1+2+3+1

This question requires the use of the Thermodynamic Property Tables supplied as additional material.In addition, for steam, the specific ideal gas constant = 461.5 J/kg KA closed system is comprised of pure water substance initially at a temperature of 500 C and a pressure of 20 MPa (state 1).The system undergoes an isochoric process whereby its pressure drops to 0.1 Mpa (state 2).(a) Evaluate the specific entropy and specific volume of the system at state 1.(b) Evaluate the specific entropy, specific volume and temperature of the system at state 2.(c) Sketch the process on a Temperature-specific entropy plot, showing the lines of constant pressure which pass through steps 1 and 2.(d) For state 1 evaluate the specific volume assuming the steam behaves as an ideal gas and comment on your result.