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Equilibrium

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meg2442:
I dont know how to solve this problem.

K value at equilibrium is 630 at 546K. The solutions are at a constant volume and begin with equimolar amounts.

The expression is
PCl5 <-> PCl3 + Cl2

What is the relationship between PCl3 and Cl2 at Eqm.

If they all start with x initially then the reactants will subtract and the products will add so I'm not sure what else to add to that? Wont PCl3 and Cl2 be the same if they start out the same and add the same amount?

Donaldson Tan:
Below is the ICE table for equilibirum at hand. X is the initial concentration and Y is the change in concentration. The change in concentration follows the stoichiometric ratio predicted by the equilibrium reaction given by meg2422.

InitialChangeEqbmPCl5 X -Y X - Y PCl3 X +Y X + Y Cl2 X +Y X + Y
The concentration of Cl2 indeed equals to the concentration of  PCl3 at initial and equilibrium condition.

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