Noxious no gas can form from n 2 and o2 gases in automobile engines at high temperatures. if the value of the equilibrium constant, kc, for this reaction at 25°c is 1.95 ×10−31, what is the value at 2,000°c

The value of equilibrium constant at 2000 C is .

Explanation:

To calculate of the reaction, we use Van't Hoff equation, which is:

where,

= vapor pressure at temperature

= vapor pressure at temperature  

= Enthalpy change of the reaction= ?

R = Gas constant = 8.314 J/mol K

We have :

Enthalpy of formation of nitrogen gas ,

Enthalpy of formation of oxygen  gas ,

Enthalpy of formation of NO gas ,

Enthalpy of the reaction =

Equilibrium constant at 25°C =

Equilibrium constant at 2,000°C =

By using Van't Hoff equation, te can be calculated:

The value of equilibrium constant at 2000 C is .

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