Calculate the equilibrium concentrations of N2O4 and NO2 at 25 C if the initial

Question

Calculate the equilibrium concentrations of N2O4 and NO2 at 25 C if the initial concentrations are [N2O4]= 0.0230 M and [NO2]= 0.0310 M.
The equilibrium constant Kc for the reaction N2O4(g)2NO2(g) is 4.64×103 at 25 C.

Constants|Periodic Table Part A Calculate the equilibrium concentrations of N204 and NO2 at 25 °C if the initial concentrations are [N204]0.0230 M and [NO2] 0.0310 M The equilibrium constant Kc for the reaction N2O4(g) 2 NO2(g) is 4.64 x 10-3 at 25 °C Calculate the equilibrium concentration of N2 04 Express your answer with the appropriate units Submit Previous Answers Request Answer X Incorrect: Try Again; 2 attempts remaining Part B Calculate the equilibrium concentration of NO2 Express your answer with the appropriate units NO20.012 M Submit Previous Answers Request Answer X Incorrect, One attempt remaining: Try Again

Explanation / Answer

                   N2O4(g) 2NO2(g)

I       0.023 0.031

C    +x -2x

E    0.023+x    0.031-2x

   kc = [NO2]^2/[N2O4]

4.64*10^-3 = (0.031-2x)^2/(0.023+x)

   4.64*10^-3 *(0.023+x) = (0.031-2x)^2

             x = 0.00937

   [N2O4]    = 0.023+x

                  = 0.023+0.00937 = 0.0324M

[NO2]        = 0.031-2x

                   = 0.031-2*0.00937 = 0.0122M

check out Kc

    Kc = [NO2]^2/[N2O4]

          = (0.0122)^2/0.0324 = 0.00464

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