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Reaction between N2 and O2 takes place as follows: 

If a mixture of 0.482 mol of N2 and 0.933 mol of O2 is placed in a 10 L reaction vessel and allowed to form N2O at a temperature for which Kc = 2.0 × 10–37, determine the composition of equilibrium mixture. 

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Let the concentration of N2O at equilibrium be x. 

The given reaction is: 

Therefore, at equilibrium, in the 10 L vessel: 

The value of equilibrium constant i.e. Kc = 2.0 × 10–37 is very small. Therefore, the amount of N2 and O2 reacted is also very small. Thus, x can be neglected from the expressions of molar concentrations of N2 and O2. Then,

  

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