$$

$($well$-$insulated piston$-$

cylinder assembly$).(P_{\text{s}\text{u}\text{r}\text{r}})5$ bar $1$ mol $$

$($ideal gas$).0\mathrm{.}05m^2$

$5000$ kg $().$

$5000$ kg $$

$().($molar

heat capacity at constant volume $(\frac{?}{\text{b}\text{a}\text{r}}(C{)}_v))\frac{5}{2}R$

$$ g $($gravitational constant$)9\mathrm{.}81m*s^{-2}.$

$(R=0\mathrm{.}08314L\frac{*}{b}ar*K^{-1}=8\mathrm{.}314J*K^{-1}*mo{l}^{-1})$

$(1)$

$.$

$.$

$(2)$ in $($:$K\}.$

$(3)S_{sy,}{S}_{\text{s}\text{a}\text{r}}($in J $*K^{-1})$

$.$

$(4),$

$2..$