Water vapour expands in an isentropic turbine with a single inlet and outlet. The vapour inlet has a pressure of $2\mathrm{.}5$ MPa and a temperature of $350\backslash$deg C$.$ The vapour pressure at the outlet is $125$ kPa. Find the work potential in this turbine in kj$/$kg$.($Show all numerical operations one by one, state the assumptions$).$