Question

13.2 Magnesium can be removed from Mg-Al liquid solution by selectively forming the chloride MgCl,. Calculate the activity of Mg in the liquid Mg-Al system which can be achieved at 800 C by reacting the solution with an mixture containing hydrogen at essentially 1 atm pressure and pH = 10-5 atm to form pure liquid MgCl2. H2-HCl gas 12 2 TL

Answer 1

Hi 2-H S alm T 800 Co9 C ilalkethe satnated Uap 2ire Aatone eguaho otTthic tempentune CtT c in bay Ti temptue ink PatVap p -the Contat A B.C 535.13 3130- 31-S4 kaatan 1208 ba)

P-Bxxi 8-23 70-9 goltion We Con sumuJhi, -his Auiuty duneax 01 4.13 x1o C2mol
we can see that the partial pressure of the HCl liquid in the has is given.

We can calculate the vapor pressure at this temperature by using Abtonie equation.

Further we can apply Roults law to find the mole fraction in the liquid.

Once the mole fraction of the liquid is know we can assume that this all HCl is getting consumed in the reaction and the decrease in the activity can be calculated.

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