Question

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)

Δ Hrxn = −1.65 × 103 kJ

(a) What is the ΔH_rxn when 0.250 kg of iron rusts?

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10 kJ

(b) How much rust forms when 6.80

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10³ kJ of heat is released?

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10 g Fe₂O₃