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Chemical equilibrium

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For the equilibrium:

PCl5(g) PCl3(g) + Cl2(g)

Kc = 4.0 at 228°C. Pure PCl5 is added to the reaction system. At equilibrium there is 0.16 M PCl5. What is the concentration of PCl3 in this system?

Answer = .80M

But what are the steps to get this answer?

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The given reaction is:
PCl5(g) --> PCl3(g) + Cl2(g)

Therefore, the expression for equilibrium constant will ...

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