Determine the specific enthalpy of water at 5 MPa and 20°C.

The air in an automobile tire with a volume of 1.23 ft3 is at 72°F and 0.5 bar. Determine the amount of air that must be added to raise the pressure to the recommended value of 1 bar Assume the atmospheric to be 14.7 psia and the temperature and the volume to remain constant.

The wall separating the two compartments is removed and the two gases are allowed to mix. Assuming constant specific heats, find the simplest expression for the mixture temperature written in the form where m3 and T3 are the mass and temperature of the final mixture, respectively

A and B containers (fixed volume) are connected together by a valve. Tank A contains 400 kPa and 0.3 m3 refrigerant 134a at 60% dryness. Tank B contains 0.5 m3 of refrigerant 134a at 240 kPa pressure and 100 oC temperature. Then the valve is opened and the system reaches 280 kPa equilibrium pressure. Calculate the final temperature.