The equilibrium constant Kc for the reaction was found to be 0.024 at 523 K. If the equilibrium concentrations of PCl5 and PCl3 gases are 0.037 M and 0.012 M, respectively, what is the equilibrium concentration of the Cl2 gas?   A. 0.0078 M B. 0.019 M C. 0.074 M D. 1.2 M

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Chapter14: Chemical Equilibirum
Section: Chapter Questions
Problem 14.137QP: Phosphorus pentachloride, PCl5, decomposes on heating to give phosphorus trichloride, PCl5, and...
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The decomposition of phosphorus pentachloride (PCI5) to phosphorus trichloride (PCI3) and chlorine gas is a reversible process represented below.

 

PCI5 (g) ⇌ PCl3 (g) + Cl2 (g) 

 

The equilibrium constant Kc for the reaction was found to be 0.024 at 523 K. If the equilibrium concentrations of PCl5 and PCl3 gases are 0.037 M and 0.012 M, respectively, what is the equilibrium concentration of the Cl2 gas?

 

A. 0.0078 M

B. 0.019 M

C. 0.074 M

D. 1.2 M

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