kg of air is compressed isothermally and reversibly from 1 bar and 30oC to 5 bar. Calculate the work done on the air and the heat flow to or from the air. . (140 kJ, -140kJ)

An adiabatic vessel has a valve that allows some water to be released. Initially it has 500 Kg of saturated liquid wate at a temperature of 50°C. Find the following: The temperature of remaining water if 10 Kg of water vapor escapes through the valve. If the remaining water is at 20°C, find the amount of water escaped as vapor. Assume specific heat of water, C = 4 Kj/Kg-K and Enthalpy of vaporization of water, AHvap 2400 Kj/Kg

CO2 needs to be compressed from p1=1bar, t1=300k to p2=40bar to transport it to remote sites for sequestration. what is the minimum energy requirement per kg of CO2 for the compressor? Should the compressor operate adiabatically or isothermally for the best energy efficiency? The environment is at Tenv=300k. Use accurate thermodynamic data for CO2 in this problem.

Dont copy from others and answer should match. A large kitchen pot initially contains 5 kg of water at 25°C. A burner is turned on and heat is added to the water at a rate of 500 cal/sec. Determine how many minutes it will take for one-half of the mass to evaporate at standard atmospheric pressure.