Question

The standard free-energy difference between the two chair conformations of isopropylcyclohexane is 9.2 kJ mol-1 (2.2 kcal mar-1).

a) Which conformation has a higher concentration?
b) What is the ratio of concentrations of the two conformations at 25 degree C?
Calculate the ratio as the conformation present In a higher concentration over the lower one.

Answer 1

The equilibrium constant for the reaction of boat conformation to chair conformation is 0.455.

Step-by-step explanation:

In this case, the equilibrium constant can be determined using the formula:

Equilibrium Constant = ([Chair]/[Boat])

Given that the concentration of the molecules in the boat form is 68.7%, the concentration of the molecules in the chair form would be 100% - 68.7% = 31.3%.

Therefore, the equilibrium constant for the reaction of boat conformation to chair conformation is:

Equilibrium Constant = (31.3/68.7) = 0.455