A solution with a negligible boiling$-$point rise is being evaporated in a triple$-$effect evaporator using saturated steam at $121\mathrm{.}1C(394\mathrm{.}3K).$ The pressure in the vapor of the last effect is $25\mathrm{.}6$kPa abs$.$ The heat$-$transfer coefficients are $U_1=2840,U_2=1988,$ and $U_3=1420\frac{W}{m^2}.K,$ and the areas are equal. Estimate the boiling point in each of the evaporators.

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