One ton of liquid water at 80°C is brought into a wellinsulated and well-sealed 4-m × 5-m × 7-m room initially at 22°C and 100 kPa. Assuming constant specific heats for both air and water at room temperature, determine the final equilibrium temperature in the room.

The volume of 1 kg of hellum in a piston-cylinder device is initially 5 m3, Now helium is compressed to 2 m3 while its pressure is maintained constant at 130 kPa, Determine the initial and final temperatures of helium as well as the work required to compress it, in kJ. The gas constant of helium is R= 2,0769 kJ/kg-K, The initial temperature of helium is 130000 K, The final temperature of helium is 455000 The work required to compress helium is K. 455 kJ. H Next >

A piston–cylinder device initially contains 0.052 m3 of liquid water at 40°C and 200 kPa. Heat is transferred to the water at constant pressure until the entire liquid is vaporized. Use data from the steam tables What is the final temperature?

Tank A which is completely insulated contains 1 kg of oxygen at 15°C and 300 kPa. It is connected to the 2-m3 tanks B through a valve as shown below. Tank B is not insulated and contains nitrogen at 50°C and 500 kPa. An engineer opens the valve connecting the two tanks to allow the two gauges to mix. Once the valve is opened, oxygen and nitrogen form a homogeneous mixture at 25°C. Determine (a) the final pressure in the tank, (b) the heat transfer from tank B, and (c) the entropy change in the system during this process.