Question

a sample containing .800 moles of POCl3 is enclosed in a .5 liter vessel at a certain temperature. when the equilibrium for the dissociation reaction PCl3(g)<==>POCl(g) + Cl2(g) is attained, it is found that the vessel contains ,259 moles of Cl2. Calculate the equilibrium constant
I don't quite understand this reaction;
PCl3(g)<==>POCl(g) + Cl2(g)

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