Awell-insulated 10 kg steel tank is initially filled with 1 kg of air at an initial pressure, p1 , of 1 bar and an initial temperature, t1 , of 300 k. a valve is opened, and the tank is filled with more air until a pressure, p2 , of 10 bar and a temperature, t2 , of 600 k is reached. the steel tank and the air begin and end in thermodynamic equilibrium during the process. neglect kinetic and potential energy.

the molecular weight of air is mwair = 29 kg/kmol. the specific heat of steel is 0.45 kj/kg-k.

(a) heat transfer between the tank and air which occurs during the process. report your answer in kj.

(b) determine the final mass of the air. report your answer in kg.

(c) determine the temperature of air entering the system at a constant temperature. report your answer in k.

do not interpolate. instead, use the closest value on the table. identify the system(s) on the sketch provided on the following page, show mass/energy interactions with directions, list any assumptions and basic equations, and provide your solution. include assumptions and basic equations.