I have two problems and i need help please.. First one: A mass of 0.05KG of the air is heated at constant pressure of 2 bar until the volume is occupied is 0.0658 m^3. Calculate the supplied heat and the workdone if the initially temperature of the air is 130 C.?

The second and the last one: 1 KG of nitrogen is compressed reversibly and isothermally from 1.01 bar, 20 C to 4.2 bar. Calculate the workdone and the heat Flow during the process Assuming nitrogen to be a perfect gas and molar mass 28kg/kmol

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)