A metal plate of aluminum is exposed an oxygen rich atmosphere on one side and an oxygen deficient atmosphere on the other side, at 500K. Assuming steady-state diffusion has been achieved, calculate the diffusion flux of oxygen through the plate if the concentrations of oxygen at positions of 2nm and 20nm beneath the surface are 2.5 and 0.5 kg/m^3, respectively. Assume a diffusion constant of 8x10-10 m^2/sec at this temperature. If the temperature is increased to 800K, with no noticeable change in diffusion constant, what will the change in diffusion flux be?