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Question

2 moles of N2O4 is heated in a 5 lit vessel till the equilibrium reached. If 0.5 moles of N2O4 is present at equilibrium, the equilibrium constant for the reaction is:

A
3.6
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B
36
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C
0.36
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D
0.9
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Solution

The correct option is A 3.6
The given reaction is :-
N2O4(g)2NO2(g)
Initial moles : 2 0
At eqm : (2x) 2x (let)
Given, (2x)=0.5
x=1.5
Now, No. of moles of NO2 at eqm =2×1.5=3
At eqm, [N2O4]=0.55=0.1M
[NO2]=35=0.6M
Now, KC=[NO2]2[N2O4]=0.6×0.60.1=3.6M

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