Question

Nitric oxide reacts with oxygen to give nitrogen dioxide, an important reaction in the Ostwald process for the industrial synthesis of nitric acid:
2NO(g)+O2(g)?2NO2(g)

Part A

If Kc=6.9

Answer 1

Part : A

2NO(g)+O₂(g) 2NO₂(g)

We know that

Where R = gas constant = 8.314 J mol^-1 K^-1

          T = Temperature in kelvin = 227 ⁰C = 227 +273 = 500 K

        = Total no.of moles of gaseous products - total no.of moles of gaseous reactants

              = 2-(2+1)

             = -1 moles

      K_c = 6.9x10 ⁵

Plug the values we get

Part : B

Where R = gas constant = 8.314 J mol^-1 K^-1

          T = Temperature in kelvin = 1000 K

        = Total no.of moles of gaseous products - total no.of moles of gaseous reactants

              = 2-(2+1)

             = -1 moles

      K_p = 1.3x10 ^-2

Plug the values we get