$2*$

$R=8\mathrm{.}314\frac{J}{m}ol*K_1*R=83\mathrm{.}14*cm*$ bar$/$mol $*K,R=82\mathrm{.}06*c{m}^3*at\frac{m}{m}o\frac{l}{K}||$

I

Anideal gas is expanding isothermally from point:$(1)*$T$1=100.$C$,P_1=15$ atm to $*$ pointil

$(2)$ at$-P_2=5$ atm. Then it undergoes an isochoric process to point. $(3),$ finally byt

adliabatic compression $*$ point $*(1)$ is $*$ reached.

a$)$ Sketch this on a$-$pressure versus volume diagramil

b$)$ Calculate $V1,*V2,*V3,T2,T3,P3I$

C$)$ Callerlate the heat and work requirements and the Intemal$-$Energx and$-$Enthalex: changes for each branch and the total$-$cycle.I