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Question
At 473 K, equilibrium constant Kc for decomposition of phosphorus pentachloride, PCl5is 8.3 ×10-3. If decomposition is depicted as,
\[\ce{PCl5 (g) ⇌ PCl3 (g) + Cl2 (g)}\] ΔrH° = 124.0 kJmol–1
What is the value of Kc for the reverse reaction at the same temperature?
Solution
Value of Kc for the reverse reaction at the same temperature is:
`"K"_"c"^' = 1/"K"_"c"`
`= 1/(8.3 xx 10^(-3)) = 1.2048 xx 10^2`
= 120.48
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