Phosphorus Trichloride and Phosphorus Pentachloride Equilibrate in the Presence of Molecular

question 26

Multiple Choice

Phosphorus trichloride and phosphorus pentachloride equilibrate in the presence of molecular chlorine according to the following reaction: $\mathrm { PCl } _ { 3 }$ (g) + $\mathrm { Cl } _ { 2 }$ (g) ? $\mathrm { PCl } _ { 5 }$ (g) An equilibrium mixture at 450 K contains $\mathrm { P } _ { \mathrm { PCl } _ { 3 } }$ = 0.124 bar, $\mathrm { P } _ { \mathrm { Cl } _ { 2 } }$ = 0.157 bar,and $\mathrm { P } _ { \mathrm { PCl } _ { 5 } }$ = 1.30 bar.What is the value of K_p at this temperature?

• A)66.8 bar^-1
• B)4.63 bar^-1
• C)2.53 × 10^-2 bar^-1
• D)1.50 × 10^-2 bar^-1
• E)1.03 bar^-1

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