As shown in the figure, a 260-ft³ tank contains 25 lb of H20 initially at 30 lbf/in2. The tank is connected to a large steam line carrying steam at 200 lbf/in?, 450°F. Steam flows into the tank through a valve until the tank pressure reaches p2 = 160 lbf/in? and the temperature is 400°F, at which time the valve is closed. Steam at 200 lbf/in_². 450°F Tank Valve |(1) Initially: 30 lbf in.?, mi = 25 lb |(2) Finally: P, lbfin.?, 400°F. Determine the amount of mass that enters the tank, in Ib, and the heat transfer to the tank from its surroundings, in Btu.

1) A 10 Liter pressure cooker has an operating pressure of 400 kPa. Initially, % of the volume is filled with saturated water and the rest is saturated vapor. What temperature is the vessel? After heating for 5 hours, the pressure cooker ran dry. What was the average rate of heat transfer?

You have a tank that is 0.01 m^3 and is initially evacuated. You then hook this up to a line that supplies N2 at a pressure of P_1 = 5 bar and a T_1 = 350 K. The tank fills adiabatically (you can assume there is no heat flow to the walls of the tank), and the filling ends when no more N2 flows into the tank. Find a) the final pressure of the gas in the tank, and b) the final temperature of the gas in the tank. You can assume N2 is an ideal gas with a CP* = 29 J/mol K. NOTE: Mainly I am confused on how the evacuated tank factors into the work for b). What I did was use the ideal gas formula to find a value for N2*T2 (601.395) but I am no longer certain how to continue in the work. I was assuming the practice question had meant the temperature of the tank was 0 initially but it leads to a negative mole value. For a) I got 5 bar, arguing the flow would stop when the pressure of tank and line are equal