20. For the equilibrium PCI5(g) → PCI3(g) + Cl2(g), Kc = 4.0 at 228°C. If pure PCIs is placed in a 1.00-L container and allowed to come to equilibrium, and the equilibrium concentration of PCIS(g) is 0.19 M, what is the equilibrium concentration of PCI3? a. 0.095 M b. 0.4 M c. 0.19 M d. p.87 M e. 0.009 M

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20. For the equilibrium reaction \( \text{PCl}_5(g) \leftrightarrow \text{PCl}_3(g) + \text{Cl}_2(g) \), the equilibrium constant \( K_c = 4.0 \) at 228°C. If pure \(\text{PCl}_5\) is placed in a 1.00-L container and allowed to come to equilibrium, and the equilibrium concentration of \(\text{PCl}_5(g)\) is 0.19 M, what is the equilibrium concentration of \(\text{PCl}_3\)?

a. 0.095 M  
b. 0.4 M  
c. 0.19 M  
d. 0.87 M  
e. 0.009 M  

Correct answer: (d) 0.87 M (circle around the letter 'd').
Transcribed Image Text:20. For the equilibrium reaction \( \text{PCl}_5(g) \leftrightarrow \text{PCl}_3(g) + \text{Cl}_2(g) \), the equilibrium constant \( K_c = 4.0 \) at 228°C. If pure \(\text{PCl}_5\) is placed in a 1.00-L container and allowed to come to equilibrium, and the equilibrium concentration of \(\text{PCl}_5(g)\) is 0.19 M, what is the equilibrium concentration of \(\text{PCl}_3\)? a. 0.095 M b. 0.4 M c. 0.19 M d. 0.87 M e. 0.009 M Correct answer: (d) 0.87 M (circle around the letter 'd').
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