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Automobiles and trucks pollute the air with NO. at 2000 degree celcius, Kc for the reaction...

Automobiles and trucks pollute the air with NO. at 2000 degree celcius, Kc for the reaction

N2(g) + O2(g) <---------> 2 NO(g)

is 4.10 x 10-4 and deltaH= 180.6 kJ. What is he value Kc at 49 degree celcius?

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Answer #1

   logK2/k1    = H/2.303R [1/T1 -1/T2]

     T1     = 2000+273 = 2273K , K1 = 4.1*10-4

    T2    = 49+273      = 322K   , K2 =

logK2/4.1*10-4    = 180600/2.303*8.314 [1/2273 -1/322]

logK2/4.1*10-4    = 9432.2(0.0004399-0.0031)

logK2/4.1*10-4     = -25.09

K2/4.1*10-4       = 10-25.09

K2                 = 4.1*10-4 * 8.13*10-26

                       = 3.33*10-29 >>>> answer

                  

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