The energy that evolved during the formation of 98.7g of Fe is 1505.5 Kj
calculation
find the number of moles of iron = mass/molar mass
molar mass of iron= 55.85 g/mol
moles = 98.7 g /55.85 g/mol = 1.767 moles
energy evolved is therefore = 852 x 1.767 = 1505.5 Kj
