Question

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)

ΔHrxn = −1.65 ×103 kJ

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

(b) How much rust forms when 7.40 x 10³ kJ of heat is released? (Answer in g of Fe₂O₃)

Answer 1