round to 2 sig fig

The reduction of iron(III) oxide (Fe2O3) to pure iron during the first step of steelmaking, 2Fe2O3(s)4Fe(s)+3O2(g) is driven by the high-temperature combustion of coke, a purified form of coal: C(s)+O2(g)CO2(g) Suppose at the temperature of a blast furnace the Gibbs free energies of formation Gf of CO2 and Fe2O3 are 423. kJ/mol and 815. kJ/mol, respectively. Calculate the maximum mass of pure iron that can be produced by the combustion of 5100.kg of coke. Round your answer to 2 significant digits