Question

2. The cis- and trans- isomers of 2-butene can be thermally equilibrated in the presence of a catalytic amount of iodine:

Based on the experimental results of this equilibration, a free energy difference (G°) of about 1 kcal/mol between the two isomers can be calculated. Given this G°, calculate the equilibrium constant K for the equilibrium at 298 K.

Answer 1

We kmow that 42 RT In K A free onengy differance (2)- 1 Keal Putting all the valuas, = 1000 cal /mol 2x298) n k 1000 Temperature (T)= 298 K Rn K -2x 298 2 cal Chere) R = ln K= 250 149 K 149 e 0.18678 The value o equilibnium constamt K=0.186 78