The molar masses are:
Fe2O3 - 159.7 g/mol
Fe - 55.85 g/mol
Theoretical yield(Fe)=50.1 g(Fe2O3)×159.7 g(Fe2O3)1 mol(Fe2O3)×1mol(Fe2O3)2 mol(Fe)×1 mol(Fe)55.85 g(Fe)=35.0 g
% yield=theoretical yieldactual yield×100%=35.0 g31.7 g×100%=90.6%
Answer: 90.6%
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