Question

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 K_c = 2.0 × 10^–37, determine the composition of equilibrium mixture. 

Answer 1

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. K_c = 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,