Question 7 of 8
(-)/(2)
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A rigid copper tank, initially containing 1m^(3) of air at 295 K , 3 bar, is connected by a valve to a large supply line carrying air at 295 K , 15 bar. The valve is opened only as long as required to fill the tank with air to a pressure of 15 bar. Finally, the air in the tank is at 310 K . The copper tank, which has a mass of 20 kg , is at the same temperature as the air in the tank, initially and finally.
The specific heat of the copper is c=0.385k(J)/(k)g*K.
Assuming ideal gas behavior for the air, determine:
(a) the initial and final mass of air within the tank, each in kg, and
(b) the heat transfer to the air and copper tank from the surroundings, in kJ , ignoring kinetic and potential energy effects.