Ammonia in a piston/cylinder arrangement is at 700 kPa and 80°C. It is now cooled at constant pressure to saturated vapor (state 2), at which point the piston is locked with a pin. The cooling contin- ues to –10°C (state 3). Show the processes 1 to 2 and 2 to 3 on both a P–v and a T-v diagram and find quality x3.

Q: Draw Pv and Ts diagram of reversible isobaric process. Write the relationship between thermodynamic…

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Q: nside a piston cylinder. 10g of air is adiabatically compressed. Initially the air is at 27 degree…

A: First Law of thermodynamics: Energy can never be created nor be destroyed but it can be transferred…

Q: 200 gram of steam at 200kPa are compressed undergoing isothermal quasi-static process at 200oC until…

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Q: Refrigerant R-134a vapor in a piston-cylinder assembly, it is increased to 50°C under constant…

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Q: 3 kg air with initial temperature of 200°C expands at a constant pressure of 4 bar to reach to a…

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Q: An insulated piston-cylinder device contains 0.2 m³ of saturated refrigerant R-134a vapor at 1 MPa…

A: The piston cylinder is insulated.The volume of saturated refrigerant vapor is .The initial pressure…

Q: Determine tnejchange in the internal energy of hellum, in kJ/kg, as it undergoes a change of state…

A: given data: for state 1stP1=100kpa     T1=20+273=293Kfor state 2P2=600KPaT2=300+273=573K p(v-a)=RT…

Q: 3kg of Co2 expanded in a stationary piston cylinder through a polytropic process from 30 degree…

A: T1= 30+273= 303K, m=3kgP1=250KPa, P2=100KPan=1.45T2T1= 1002501.45-11.45=228.014KTotal Work, W=…

Q: R-410A

A: V=10l=.01m3T1=-10oCx1=.8T2=40oCWe=36kJ/kg from the R140 saturation table at T1=-10oC…

Q: R-134a fills a 0.1-m³ capsule at 20°C, 200 kPa. It is placed in a deep freezer, where it is cooled…

A: Soln:- C. v. R- 134a out to the -20°c space. Energy equation :-  m(u2-u1) = 1Q2- 1W2 Actual process…

Q: A cylinder/piston contains saturated vapour R-22 at 10°C; the volume is 10 L. The R-22 is compressed…

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Q: a cylinder and piston arrangement contains 2 kg of R-134a at 150 kPa, 60 C. The piston is now moved…

A: Given data: Initial conditions: Mass = m = 2 kg Substance : R-134a Pressure = 150 kPa Temperature =…

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.