Solved: a. What is the equilibrium constant for a reaction

Solution:

Here we have to found out the equilibrium constant.

Step 1

a . Given:

ΔHo = 20 kcal/mol

ΔSo = 5.0  10-2 kcal mol-1 K-1 

Temperature (T) = 25 oC (298 K)

The equilibrium constant Keq can be calculated as follows,

Go = - RT lnKeq

Now, we will have to calculate Go, from the given data by using the formula

Go = ΔHo - T ΔSo

         = 20Kcal/mol - (298 K0.05 Kcal mol-1K-1)

         = (20-14.9) = 5.1 kcal/mol

Thus, the free energy is 5.1 kcal/mol.