1.     Iron sample (At.wt=56g) with dimensions (10mm x 20mm x 2mm) and                         density =7.87g/cm3, is exposed to a corrosive environment (neglect thickness for surface area). Just one sides of the sample are exposed to corrosive environment with corrosion current about(icorr) 1.12×10-3 A/cm2). Calculate corrosion rate in mm/y.