Question

24. If N2O4 is 25% dissociated in a 4lit vessel at given temperature. What is the Kc for the reaction is ?
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Answer 1

Assume initially 1 mole of N2O4 is present

The following table lists the number of moles of various species.

N2O4. NO2

Initial. 1. 0

Change. -0.4. -0.8

Equilibrium. 0.6. 0.8

The volume of the vessel is 2L.

Thus, the equilibrium concentrations of

N2O4 and NO2 are 0.3M and 0.4M respectively.

The expression for the equilibrium constant becomes Kc={NO2}2/{N2O4)}=(0.4)2/0.3

=0.53