16- Air is to flow isentropically through a convergent-divergent nozzle at a rate of 1.2kg//s from a large reservoir in which the temperature is 298K. At the nozzle exit, the pressure is to be 14kPa and the Mach number is 2.8. Determine: (1) The pressures at the reservoir and at the throat (2) The throat and exit areas of the nozzle