A gas can be taken from state a to state c by two different reversibleprocesses, a →c or a →b →c. During the direct process a →c, 20 J of work are done bythe system and 30 J of heat are added to the system. During the process a →b →c, 25 J ofheat are added to the system. How much work is done by the system during a →b >c?

The first law of thermodynamics relates to the law of conservation of energy for the thermodynamic…

Answered: A gas can be taken from state a to…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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A) Give the meaning of the following terms: (1) thermodynamic system (2) thermodynamic cycle (3) thermodynamic process (4) thermodynamic law. B) Choose the correct answer, In an extensive property of a thermodynamic system: (1) extensive heat is transferred (2) extensive work is done (3) extensive energy is utilized (4) all of the above (5) none of the above. C) Which of the following is an intensive property of a thermodynamic system? (1) Volume (2) Temperature (3) Mass (4) Energy (5) Velocity D) The following is the equation which connects u, p and v for several gases: u = a + bpv, Where a and b are constants, prove that for a reversible adiabatic process, b+1 pur: = constant, Where y = b
When energy in the form of heat is added to a body, it is stored as heat. C O True O False
A fuel oil is burned with air in a boiler furnace. The combustion produces 650 kW of thermal energy, of which 55% is transferred as heat to a boiler tubes that pass through the furnace. The combustion products pass from the furnace to a stack at 650°C. Water enters the boiler tubes as a liquid at 20 °C and leaves the tubes as saturated steam at 20 bar absolute. a. Define the system. What type of energy balance is needed?
Two insulated tanks, A and B are connected by a valve. Tank A has a volume of 0.70m3 andcontains steam at 1.5bar, 200OC. tank B has a volume of 0.35 m3 and contains steam at 6 barwith quality as 90% dry. The valve is then opened and two tanks come to a uniform state. Ifthere is no heat transfer during the process, find what is the final pressure.
A heat exchanger is used to transfer heat from a steam stream to a chlorine gas stream. 100 kg of steam at 1 bar and 200 °C enters the heat exchanger and leaves the exchanger as saturated steam at 1 bar. Chlorine gas enters the exchanger at 1 bar and 48.0 °C and leaves the exchanger at 141.0 °C. Assume the heat exchanger is adiabatic. What is the specific enthalpy of the inlet steam stream? (Use liquid water at 0.01 °C as a reference state.) Ĥ și= kJ/kg What is the specific enthalpy of the outlet steam stream? (Use the same reference state.) 50= kJ/kg What is the specific enthalpy of the inlet chlorine gas stream? (Use chlorine gas at 1 bar and 48.0 °C as a reference state.) Ĥci= kJ/mol What is the specific enthalpy of the outlet chlorine gas stream? (Use chlorine gas at 1 bar and 48.0 °C as a reference state.) ÊĤ co= kJ/mol How many moles of chlorine gas enter the heat exchanger? nc = mol What is the ratio of the volume of inlet steam to the volume of inlet chlorine gas? Use the ideal…
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A rigid tank contains 10% of water vapor and 90% of liquid water at a pressure of 100 kPa. The tank has a relief valve on the top such that it opens when the pressure in the tank reaches 600 kPa. An amount of 10 kJ/min are transferred to the tank and vapor is discharged when the pressure in the tank gets to 600 kPa. Heat keeps being transferred into the tank such that the pressure remains at 600 kPa. The volume of the tank is 2 m3. a) Determine the temperature in the tank when the relief valve opens. b) How long does it take for the tank to contain 75% vapor?
A piston–cylinder device contains 0.05 kg of steam at 1 MPa and 300°C. Steam now expands to a final state of 200 kPa and 150°C, doing work. Heat losses from the system to the surroundings are estimated to be 2 kJ during this process. Assuming the surroundings to be at T0 = 25°C and P0 = 100 kPa, determine the exergy change of the steam.
A heat engine has an efficiency of 30% and emits waste heat to a sink at 8°C. If the heat source's temperature will be increased by 200K, how will this affect the efficiency?
2-Steam initially at 10 bar and 0.25 dryness fraction (i.e quality=85%.). Expands down to P₂= 3.5 bar According to the hyperbolic law. PV=Constant, Determine. 1. The final of the steam. 2- The change of temperature of the steam. 3. The work done kg during the change. 4 The change in internal energy. 5- The amount of heat supplied

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