Tete a, b, and c are temperature independent paraneters 2. 1.000 nol of NaOH is

Question

Tete a, b, and c are temperature independent paraneters 2. 1.000 nol of NaOH is dissolved in 4559 niol of water At 15 °C,pm perature the vapor pressure of pure water i 12 788 ton and 4471 10n the NaOH/H,O mixture. Asuming that the vapor follows the ideal ghs haw and the binary NaO11/1I,O misture can he connidered aa at idal tio Calculate the following: n) activity coeflient of HiO in the Nat/ t,O tn b) the corresponding activity of lhO Note that the vapor nlove the NnOH/Hs0mtion consists only of ILO 3. Consider the followid lül

Explanation / Answer

(a) aw = Xw * Yw

where aw = activity of water

Xw = molefraction of water

  Yw = activity coefficient of water

aw =12.788/4.474 = 2.858

Xw = 4.55/(1+ 4.55) = 0.8198

Yw = 2.858 / 0.8198 = 3.48

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