For the reaction \( 2\text{NO}_2 (g) \rightleftharpoons \text{N}_2\text{O}_4 (g) \), when \( \Delta S = -176.0 \, \text{J K}^{-1} \) and \( \Delta H = -57.8 \, \text{kJ mol}^{-1} \), the magnitude of \( \Delta G \) at \( 298 \, \text{K} \) for the reaction is ____ \( \text{kJ mol}^{-1} \).
