The pressure of a liquid is increased isothermally. The molar volume of the liquid decreases from $50.45\times 10^{-6}$ $m^{3}$/mol to $48\times 10^{-6}$ $m^{3}$/mol during this process. The isothermal compressibility of the liquid is $10^{-9}$ $Pa^{-1}$, which can be independent of pressure.
The change in the molar Gibbs free energy of the liquid, rounded to nearest integer, is ________ $J$/mol.