1)

 The following reaction is performed at 298K 2NO(g)+O2(g)2NO2(g). The standard free energy of formation of NO (g)  is 86.6kJ/mol at 298K. What is the standard free energy of formation of NO2 (g)  at 298K? (Kp=1.6×1012)


A) R(298) in ( 1.6×1012)-86600

B) 86600+R(298)ln ( 1.6×1012)

C) 86600- ln(1.6×1012)R(298)

D) 0.5[2×86600R(298)ln(1.6×1012)]

Answer:

Option D

Explanation:

 For the given reaction,

     2NO(g)+O2(g)2NO2(g)

 Given,   G0f(NO)=86.6kJ/mol

    G0f(NO2)=?

              Kp=1.6×1012

Now , we have

   G0f=2G0f(NO2)[2G0f(NO)+G0f(O2)]

                  RTlnKp=2G0f(NO2)(2×86600+0)

   G0f(NO2)=12

                                                            [2×86600R×298ln(1.6×1012]

   G0f(NO2)=0.5

                                                   [2×86600R×(298)ln(1.6×1012)]