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:
4Fe(s) + 3O₂(g) → 2Fe₂O₃ (s)
ΔΗᵣₓₙ = -1.65 × 103 kJ
Round each of your answers to 3 significant figures.

What is the ∆Hᵣₓₙ when 0.250 kg of iron rusts?