Using data in the table below, calculate the self-diffusivity for iron in bcc iron at 1200 ∘C. Diffusivity Data for a Number of Metallic Systems Solute Solvent D0(m2/s) Q(kJ/mol) Q(kcal/mol) Carbon Fcc iron 20×10−6 142 34.0 Carbon Bcc iron 220×10−6 122 29.3 Iron Fcc iron 22×10−6 268 64.0 Iron Bcc iron 200×10−6 240 57.5 Nickel Fcc iron 77×10−6 280 67.0 Manganese Fcc iron 35×10−6 282 67.5 Zinc Copper 34×10−6 191 45.6 Copper Aluminum 15×10−6 126 30.2 Copper Copper 20×10−6 197 47.1 Silver Silver 40×10−6 184 33.1 Carbon Hep titanium 511×10−6 182 43.5 Express your answer to three significant figures.