As you may have already discussed with your instructor, you can analyze circuits containing cascaded ideal opamp stages by considering them independently and multiplying their gains. In this case, the first stage is an inverting op amp while the second stage is also an inverting opamp but with two inputs (you can use superposition and consider each input independently if it helps).

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.