$[1\mathrm{.}5$ marks$]$ An ideal gas undergoes an isentropic compression in which temperature increases from $340K$ to $415K.$ Calculate the work done per mole on the system in $\frac{J}{m}ol.$ The ratio $\frac{c_p}{c_v}$ is $1\mathrm{.}5.$ Boundary work mole $K$

Work done per mole $=,\frac{J}{m}$ole

$3.[1$ mark$]$ Provide and derive an expression for $h($per unit mass$)$ for a liquid undergoing a change in pressure $p$ and a change in temperature $T.$ Notation: $c=$ specific heat capacity.