At equilibrium, the concentration of : `N_2=3.0xx10^(-3)` M, `O_2=4.2xx10^(-3)` M and `NO=2.8xx10^(-3)` M in a sealed vessel at 800 K. What will be `K_c` for the reaction
`N_(2(g)) + O_(2(g)) hArr 2NO_((g))`

Explanation

`{:("Reaction:" ,N_(2(g)) + , O_(2(g)) hArr , 2NO_((g))),("Concentration at equilibrium:" , 3.0xx10^(-3)M, 4.2xx10^(-3)M,2.8xx10^(3)M):}`
Equilibrium constant of reaction is `K_c`,
`K_c=[NO]^2/([N_2][O_2])=(2.8xx10^(-3)M)^2/((3.0xx10^(-3)M)(4.2xx10^(-3)M))`
= 0.6222