A sample of pure PCl 5 was introduced into an evacuated vessel at 473 K- After equilibrium was attained- concentration of PCl 5 was found to be 0-5 - 10-1 mol L -1- If value of Kc is 8-3 - 10-3- what are the concentrations of PCl 3 and Cl 2 at equilibrium- PCl 5 g - PCl 3 g - Cl 2 g

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Byju's Answer

Standard XII

Chemistry

Factors Affecting Rate Constant

A sample of p...

Question

A sample of pure PCl₅ was introduced into an evacuated vessel at 473 K. After equilibrium was attained, concentration of PCl₅ was found to be 0.5 × 10^–1 mol L^–1. If value of K_c is 8.3 × 10^–3, what are the concentrations of PCl₃ and Cl₂ at equilibrium?

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Solution

Let the concentrations of both PCl₃ and Cl₂ at equilibrium be x molL^–1. The given reaction is:

Now we can write the expression for equilibrium as:

Therefore, at equilibrium,

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A sample of pure $P C l_{5}$ was introduced into an evacuated vessel at 473 K. After equilibrium was attained, concentration of PCl_5 was found to be $0.5 \times 10^{- 1} m o l L^{- 1} . I f v a l u e o f K_{c} i s 8.3 \times 10^{- 3}$ , what are the concentrations of $P C l_{3}$ and $C l_{2}$ at equilibrium?\\
$P C l_{5} (g) \leftrightarrow P C l_{3} (g) + C l_{2} (g)$