A15.6 g sample of ethyl alcohol absorbs 0.207 kcal of energy as it is heated. if the initial temperature of the ethanol was 21.5 °c, what is the final temperature of the ethanol? (cethanol = 0.58 kcal/kg °c) 22.9 ° c 25.0 ° c 44.4 ° c

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)