Steam at $300\backslash$deg C and $10$ bar is in a $5$ m$3$ closed insulated cylinder with portable stamp. The piston can be compressed in the cylinder adiabatically so that the volume goes down to $2\mathrm{.}5$ m$3.$ When the piston $($incl the steam$)$ is compressed like this, then $3750$ kJ of work must be done on it the piston$/$steam$.$

a$)(25\%)$ What is the $$ value of the steam after the compression?

b$)(5\%)$ How does the temperature of the system change after the defrosting $($constant$,$ increases, decreases$)?$ Explain