3-phosphoglycerate is converted to 2-phosphoglycerate by phosphoglycerate mutase within a cell (see reaction equation below). The ΔG'° of this reaction is -4.44 kJ/mole. If within the cell the concentration of 3-phosphoglycerate is 2 mM and the concentration of 2-phosphoglycerate is 100 mM, the actual ΔG of this reaction at 25 °C is _______________ kJ/mol. (Please use 3 significant figures in answer)