P$1.$ After the fresh feed solution of $10W$ trisodium phasphate $(N{a}_{3}PO)$ by mass is mixed with the recy stream, it enters an evaporator and its water is removed untilits concentration becomes $34N{a}_{3}F$ by mass. This concentrated solution obtained is cooled to $20C$ in a crystallizer and $100kgN{a}_{1}P{O}_4\mathrm{.}12H_{2}O$ crystals are obtained per hour. While $10\%$ of the saturated solution coming out of $1$ crystallizer is thrown out lor cleaning purposes as purge stream, the remaining part is recycled a mixed into the fresh leed stream fed to the system. Accordingly, calculate the following:

a$)$ Mass of fresh feed sent to the system per haur,

b$)$ The mass of the waste stream thrown out for cleaning purposes as purge stream,

c$)$ Calculate the mass of evaporated water

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Note: The solubwity of trisodium phosphate in $20C$ water is $11kgNa{s}_{3}PO$ MOO $kg{H}_{2}O.$