Chapter 6, Problem 6.41CU

Define the entropy of a pure substance is determined from the tables (like other properties).

6. A certain quantity of gas occupies 0.56 m³ at 400° C and 28 bar. Determine the gain in entropy if the gas expands isothermally to a final volume of 2.8 m². R= 287 J/kg K. the following creas Ans. 3.746 kJ/KI

a) Explain the argument based on the Carnot cycle for why AS= s must be a state function for every chemical system in the universe. b) Using the Nernst equation, explain how to charge a battery by applying an external voltage. c) Show how the Boltzmann entropy formula can be used to compute the entropy change for one mole of gas doubling its volume.

Using steam table data, determine the indicated property data for a process in which there is no change in specific entropy between state 1 and state 2. In each case, locate states on a sketch of the T-s diagram.

Multiple choice Questions Question No. 2: When a system is taken from state A to state B through a reversible path 1 and again the system is taken to its initial state A from B through different reversible path 2, then what will be the effect on entropy? a.entropy increasesb.entropy decreasesc. entropy remains constantd. none of the above

Steam at a pressure of 21 bar and a dryness fraction of 0.9 occupies a volume of 0.427 m' in a cylinder behind a piston is allowed to expand reversibly to a pressure of 7 bar according to the relationship, PV1.25 = Constant. Sketch the process on the p-v diagram and calculate the work and heat transfers in kJ. %3D

A 300-lb iron casting, initially at 1050°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 Touthoolk ond Medie

Please don't use Artificial intelligence.

Consider 0.75 kg of N2 at 300 K, 1 bar contained in a rigid tank connected by a valve to another rigid tank holding 0.3 kg of CO2 at 300 K, 1 bar. The valve is opened and gases are allowed to mix, achieving an equilibrium state at 280 K.   determine the entropy change of each gas and of the overall system, in kJ/K.