The initial carbon content (co) of the sample is 0.2 wt %. you are using a carbon rich environment (hydro-carbon gas) to set the surface-carbon content (c) at 1.0 wt %. using the figure 5.11 (no need to use error function), calculate how long it would take at 1500 degree c to reach a carbon content of 0.4 wt % at a distance of 5 mm from the surface. give answer in hour unit. highlight your final answer. note: temperature is 1500 degree c -not 1000 degree c.