1.

At473 K, equilibrium constant Kcfordecomposition of phosphorus pentachloride, PCl5is 8.3 ×10-3.If decomposition is depicted as,rH°=124.0 kJmol–1a) Write an expression for Kcforthe reaction.b) What is the value of Kcforthe reverse reaction at the same temperature?c) Whatwould be the effect on Kcif (i) more PCl5is added (ii) pressure is increased? (iii) The temperature isincreased?

Answer»

At
473 K, equilibrium constant Kcfor
decomposition of phosphorus pentachloride, PCl5
is 8.3 ×10-3.
If decomposition is depicted as,


rH°
=
124.0 kJmol–1


a)
Write an expression for Kc
for
the reaction.


b)
What is the value of Kcfor
the reverse reaction at the same temperature?



c) What
would be the effect on Kc
if (i) more PCl5
is added (ii) pressure is increased? (iii) The temperature is
increased?



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