Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars a day. The actual process requires water, but a simplified equation is 4Fe(s) + 3O2(g) → 2Fe2O3(s) ∆H = -1.65x103 kJ (a) How much heat is released when 0.250 kg of iron rusts? (b) How much rust forms when 4.85x103 kJ of heat is released?

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