You find that carbon takes 213 s to diffuse to a concentration of 0.5 wt% at a depth of 0.1 mm in BCC iron if the initial concentration is 0.2 wt% and the surface is maintained at 1 wt% at 700 C. What temperature will allow the same process to reach this concentration in 800 s?

Use D ₀ = 6.0E-07 m ² /s, E _d = 80KJ/mol, remember to use the correct units, use both equation 6.22 and 6.6 from the textbook