$1.-$ Steam is expanded at $260\backslash$deg C and $7\mathrm{.}00$ bar absolute through a nozzle at

$200\backslash$deg C and $4\mathrm{.}00$ bar. A negligible amount of heat is transferred from the nozzle to

the surroundings. The approach speed of the steam is negligible. The

specific enthalpy of the vapor is $2974$ kJ$/$kg at $260\backslash$deg C and $7$ bar, $2860$kJ$/$kg at $200\backslash$deg C and

$4\mathrm{.}00$ bar

a$)$ Sketch the process system

b$)$ state the energy balance of the process

c$)$ Use an open system energy balance to calculate the rate of

steam outlet