One mole of pure \( \mathrm{PCl}_{5} \) is placed in an evacuated container and maintained at \(...

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One mole of pure \( \mathrm{PCl}_{5} \) is placed in an evacuated container and maintained at \( 250^{\circ} \mathrm{C} \). The equilibrium is established at total pressure of 2 atm. What is the partial pressure of chlorine at equilibrium?
\( \mathrm{PCl}_{5}(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_{3}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g}): K_{\mathrm{P}}=1.6 \) atm
(a) \( 0.4 \mathrm{~atm} \)
(b) \( 0.67 \mathrm{~atm} \)
(c) \( 0.80 \mathrm{~atm} \)
(d) \( 0.64 \mathrm{~atm} \)
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