Chapter 6, Problem 6.87P

Q3: Two kilograms of nitrogen at 100 K, x =0.5 is heated in a constant pressure process to 300 K in a piston/cylinder arrangement. Find the initial and final volumes and the total heat transfer required.

A piston/cylinder shown in Fig. P3.108 contains 0.5 m3 of R-410A at 2 MPa, 150°C. The piston mass and atmosphere give a pressure of 450 kPa that will float the piston. The whole setup cools in a freezer to –20°C. Find the heat transfer and show the P-v diagram for the process. R-410A Figure P3.108

I need quick solution with explanation. Answer seems to be 4.12kJ

Hi, pls help me solve this problem. Thank you so much.

In a closed system, some water is heated to 50 oC. Then it is taken the air by vacuum in the system. What kind of observation would be expected regarding water in the closed system?

A frictionless piston-cylinder device encloses 0.226 kg of saturated water-vapour mixture which is initially 10% by mass in liquid. The initial pressure is 1.035 MPa. The fluid is now heated until it all becomes saturated vapour. a. Find the work done during the process. Now, suppose that there is a stop in the cylinder that limits the piston to stop at the top when the volume is 0.0424 m'. b. Find the quality of the mixture when the piston just reached the stop, i.e. when the fluid volume is at 0.0424 m³.

Q3/ A cylinder fitted with a movable piston contains water at 3 MPa, 50% quality, at which point the volume is 20 L. The water now expands to 1.2 MPa as a result of receiving 600 kJ of heat from a large source at 300°C. It is claimed that the water does 124 kJ of work during this process. Is this possible?

Assume 20 lbm of an ideal gas with R=50 ft-lb/lb-R and k=1.18 are heated from 75 to 200F. What is the change in internal energy

The molar specific heat at constant volume of an ideal gas is equal to 2.5times the universal gas constant (8.314J/mol-K). When the temperature increases by 150K. Find the change in molar specific enthalpy.