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2. Chapter 2] Calculate the percentage ionic character of a compound that has elements with electronegativity of 1.5 and 3.5. B. 39% A. 18% C. 50% D. 63 E. 92 3. (Chapter 3] Estimate the volume (nm) of a unit cell of gold (FCC, atomic radius of 0.1442 nm) at 20C A. 0.037 B. 0.068 C. 0.099 D. 0.453 E. 9.79 5. (Chapter 41 Estimate the fraction of atomic sites that are vacant in platinum at 1000C. In platinum, the activation energy for vacancy formation is 1.31 eV/atom. 1.862-10 B. 3.98-10 C. 153-10 D251-10 E 6.55.10 6. Chapter 5) plate of iron is exposed to a carburizing atmosphere on one side and a decarburiring atmosphere on the other side at 800C. If steady-state is achieved, calculate the diffusion coefficient (m /s] at this temperature if the concentrations of carbon at 2 and 6 mm beneath the carburizing surface are 19 and 14 kg/m' respectively and the diffusion flux is 8.1.10 kg/m 1.00 B-648-10 C610 D10 E 68-10