Question

How much energy is evolved during the formation of 98.7 g of fe, according to the reaction below? fe2o3(s) + 2 al(s) → al2o3(s) + 2 fe(s) δh°rxn = -852 kj?

Answer 1

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