The mass of Fe that is formed is 0.0532 grams
Explanation
Fe2O3 + 2 Al → Al2O3 + 2 Fe
Step 1: find the moles of Al
moles = mass/molar mass
from periodic table the molar mass of Al= 27 g/mol
moles = 0.0257g /27 g/mol =9.5 x10^-4 moles of Al
Step 2: use the mole ratio to determine the moles of Fe
the moles ratio of Al:Fe is 2:2= 1:1
therefore the moles of Fe is also = 9.5 x10 ^-4 moles
Step 3: find the mass of Fe
mass= moles x molar mass of Fe
from periodic table the molar mass of Fe= 56 g/mol
mass= 9.5 x10 ^-4 moles x 56 g/mol =0.0532 grams
