Question

How many kilojoules of heat will be released when exactly 1 mole of iron, Fe, is burned to form Fe2O3(s) at standard state conditions?

a) 63 kJ
b) 196 kJ
c) 824 kJ
d) 824,000 kJ

Answer 1

The enthalpy change when 1 mole of iron is burned to form Fe₂O₃(s) is -824 kJ/mol. The correct option is (c).

Step-by-step explanation:

The enthalpy change of a reaction can be calculated using the standard enthalpy of formation values of the reactants and products. For the reaction of burning 1 mole of iron to form Fe₂O₃(s), the standard enthalpy of formation of Fe₂O₃(s) is -824 kJ/mol.

The enthalpy change is therefore -824 kJ/mol, indicating that 824 kJ of heat will be released when 1 mole of iron is burned to form Fe₂O₃(s).