II

a$)$ A block of cast fon weighing $*100*kg$ emerges from the foundyy at $800*K$ andheeds. to be cooled to $315*K$ betore it can be transpaited. Weter at $295K$ is availetele trom a tiver nearby. Caloulate how many liters: $($kg$)$ of weterls neededfor cooling the tion. II

b$)$ Caloulate the entropx changes of the iron block and the water respectivelys and also colloulate the total entrope change il II

c$)$ If this cooling process was to be made in two steps where the ifon blockis tifst cooled to $450*K$ by $xkg*$ of water at $295*K-$ and then $*$ cooled to $315*K*by*Y*kg-$ of water at $295-K$ please calculate X and. Y$,$ also calculate the entropy changes foriron, watter and overall for each step. How cloes the total$-$entropy change of the $2-$step coolling process compare to pait: $($b$)?$ Which process would you prefer, a$)-$ orf b$).$ please explain brisily: T