A mixture of 80 percent N2 and 20 percent CO2 gases (on a mass basis) enters the

Question:

A mixture of 80 percent N2 and 20 percent CO2 gases (on a mass basis) enters the nozzle of a turbojet engine at 90 psia and 1800 R with a low velocity and it expands to a pressure of 12 psia. If the isentropic efficiency of the nozzle is 92 percent, determine
(a) The exit temperature and
(b) The exit velocity of the mixture. Assume constant specific heats at room temperature.