Be sure to answer all parts. Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars every day. Although the actual process also requires water, a simplified equation (with rust shown as Fe2O3) is: 4 Fe(s) + 3 O2(g) → 2 Fe2O3(s) AH –1.65 x 103 kJ (a) What is the Ahr when 0.250 kg of iron rusts? x 10 kJ (b) How much rust forms when 2.90 x 109 kJ of heat is released? x 10 g Fe2O3