The last reaction in glycolysis involves transfer of a phosphate group from phosphoenolpyruvate to ADP, yielding pyruvate and ATP. The coupled ΔG°' of this reaction is -31.4 kJ/mol. If ΔG°' of ATP hydrolysis is -30.5 kJ/mol, what is the ΔG°' of hydrolysis of phosphoenolpyruvate?