One kg of air is contained in a closed tank at 300k, with rigid walls. heat is now added to increase the air temperature by 1°c. find the amount of heat added to the system, and the change in internal energy and enthalpy of the system. ii) one kg of air is contained in a closed tank at 300k, with a massless piston at one end. the pressure outside is 1 atm. heat is now added to increase the air temperature by 1°c. find the amount of heat added to the system, and the change in internal energy and enthalpy of the system. iii) solve above (i) and (ii) if the temperature increase is 2°c, rather than 1°c. given: assume constant cp=1.005 kj/kg k, and cv=0.718 kj/kg k.