H + Free Energy Change C—H AG=free energy of(products-reactants amount of energy available to do work Negative values indicate spontaneity △G=R7(nKe) Wherer=1.987 cal/K-mol and T= temperature in kelvins Since chlorination has a large Kea, the free energy change is large and negative Chapter 4Chapter 4 11 Free Energy Change • DG = free energy of (products - reactants), amount of energy available to do work. • Negative values indicate spontaneity. • DGo = -RT(lnKeq ) where R = 1.987 cal/K-mol and T = temperature in kelvins • Since chlorination has a large Keq , the free energy change is large and negative. =>