Please help me do this for a thumbs up, i need to know how to figure it out using these values to not be confused with step by step help.

--Given Values-- Concentration of Nitrogen (wt\%): =0.24 Position in mm=4.2 Diffusion Coefficient for Nitrogen in Iron at 700C=6.30E10 Nitrogen in Iron Heat Treatment Time (hours): =19 Carburizing Time (hrs): =6 Steel Alloy Case Depth (mm):=3.7 Steel Alloy New Case Depth (mm)=7.9 Activation Energy kJ/mol:=102 Temperature for Problem 3 (Celsius): =814 - = Data for Problem 4 Temperature in C:=600 Diffusivity (m2/s)=5.24E14 Temperature in C:=705 Diffusivity (m2/s)=3.76E13 Nitrogen from a gaseous phase is to be diffused into pure iron at 700C. If the surface concentration is maintained at the level listed above, what will be the concentration (in weight percent) with the given case and heat treatment time? The diffusion coefficient for nitrogen in iron at 700C is given above. (Round your answer to the ten thousandths place, 0.0000 ) Your Answer = Incorrect. Problem 2: For a steel alloy it has been determined that a carburizing heat treatment for the time, given above, will raise the carbon concentration to 0.42 wt\% to the depth given from the surface. Estimate the time necessary to achieve the same concentration at the new position stated above for an identical steel and at the same carburizing temperature (in hours). Your Answer = Problem 3: The activation energy for the diffusion of species A in metal B is listed above. Calculate the diffusion coefficient at the temperature listed, given that the value of D at 1110C is 6.21011m2/s. Write your answer in scientific notation. Your