18- A large tank supplies air to a converging-diverging nozzle. The pressure and temperature in the tank are 6MPa and 1000K, respectively. The flow through the nozzle is isentropically. The exit cross sectional area of the nozzle is 0.001m^(2). Mach number at exit section is 3.0. Determine the throat area and the mass flow rate through the nozzle. ir flows through an isentropic converging-diverging nozzle (Fig. 2)