Engineering thermodynamic. Please need the solution ASAP.. Dont skip any step.. thankyou

QUESTION 8 (12 Marks) A rigid, insulated tank that is initially evacuated is connected through a valve to a supply line that carries steam at 4 MPa (Figure 2). Now the valve is opened, and steam is allowed to flow into the tank until the pressure reaches 4 MPa, at which point the valve is closed. The final temperature of the steam in the tank is 500C. (a) What is the system in question here? (1 Mark) (b) Determine the temperature of the steam in the supply line, and (5 marks) (C) Determine the flow work per unit mass of the steam. (6 marks) Steam 4 MPa 0 4 MPa 500C Figure 2: A rigid, insulated tank