A plate of iron is exposed to a carburizing (carbon-rich) atmosphere on one side and a decarburizing (carbon-deficient)

atmosphere on the other side at 700C°. If a condition of steady state is achieved, calculate the diffusion flux of carbon

through the plate if the concentrations of carbon at positions of 5 and 10 mm (5x10³ and 10² m) beneath the carburizing

surface are 1.2 and 0.8 kg/m³, respectively. Assume a diffusion coefficient of 3 x 10¹ m²/s at this temperature.