Another Equilibrium Problem - Do Both Using 5 Percent Rule And Without

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Answer the following problem WITHOUT using 5 % rule then again With using 5% rule.

At 250°C, the Equilibrium constant for the reaction :

1 PCl_{5 (g)} <==> 1 PCl_{3 (g)} + 1 Cl_{2 (g)} K = 2.15

If the PCl_{5 (g)} was initially the only gas present in the reaction vessel at 0.012500 atm, calculate the partial pressure of all the gases after equilibrium has been reached.