a) Write the chemical equation for the for the dissociation of magnesium chlorid

Question

a) Write the chemical equation for the for the dissociation of magnesium chloride into the metal and gaseous chlorine.

b) At 1000 K, what is the pressure of chlorine in equilibrium with liquid metallic magnesium and pure, liquid magnesium chloride?

c) In an attempt to produce metallic magnesium, pure magnesium chloride is to be treated in an electrochemical cell at 1000 K. What is the minimum voltage required to produce pure liquid magnesium and pure chlorine at 1 atm pressure?

Explanation / Answer

a) MgCl2(l) ----------> Mg(l) + Cl2(g)

b) Given delta G = -605000 + 125.4T(K) J

At 1000K

Delta G = -605000 + 125.4(1000)

= -479600 J

for the give reaction Kp =PCl2

and Delta G = -2.303 RT log Kp

-479600 J = -2.303 x 8.314 x 1000 log K

Kp = 1.096x1025

Thus Kp = PCl2 = 1.096x1025

C) We know Delta G = -nFE

-479600 = -2 x96500 x E

Thus the minimum voltage E = 2.48 V

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