Oxygen gas is maintained at pressures of \(1.5 \mathrm{bar}\) and 0.5 bar on opposite sides of a rubber membrane that is \(0.75 \mathrm{~mm}\) thick, and the entire system is at \(25^{\circ} \mathrm{C}\). What is the molar diffusive flux of \(\mathrm{O}_{2}\) through the membrane? What are the molar concentrations of \(\mathrm{O}_{2}\) on both sides of the membrane (outside the rubber)?