Problem $2.$ A gas with properties and $MW=19$ at $3$MPa and $2400K$ enters a

converging nozzle with a negligible velocity. The throat area is $15c{m}^2.$ Assume isentropic flow.

a$)$ Calculate and plot the exit pressure, the exit velocity, and the mass flow rate versus

back pressure $P_b$ for $1\mathrm{.}0P_{b}0\mathrm{.}1$MPa.

b$)$ Repeat part a$)$ for the same nozzle but for inlet conditions of $1\mathrm{.}0$ MPa and $300K.$ Put

the results on the same $3$ plots as in part a$).$