$($i$)$

$($a$)$ How much energy must be added to the system by heat as it goes from A through $B$ to $C?$

J

$($b$)$ If the pressure at point $A$ is five times that of point $C,$ what is the work done on the system in going from $C$ to $D?$

J

$($c$)$ What is the energy exchanged with the surroundings by heat as the gas goes from $C$ to A along the green path?

J J